Nucleic Acid Encoding novel protein tyrosine kinase

ABSTRACT

A novel protein tyrosine kinase, JAK3, and a polynucleotide sequence encoding JAK3 polypeptide are disclosed herein. JAK3 is a new member of the JAK family of protein tyrosine kinases which are important in regulation of cellular proliferation and differentiation. Also disclosed are therapeutic methods utilizing JAK3 polypeptide and polynucleotide sequences.

The present invention was made with government support under grant no. CA 06973 from the National Institutes of Health. The government has certain rights in the invention.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a protein tyrosine kinases and specifically to JAK3, a novel protein tyrosine kinase of the JAK family.

2. Description of Related Art

Proliferation and differentiation of hematopoietic cells is dependent upon the binding of hematopoietic growth factors and cytokines to their respective cell surface receptors (Cross, et al., Cell, 64:271, 1991; Ogawa, M., Blood, 81:2844, 1993; Heimfeld, S., et al., Proc. Natl. Acad Sci. USA, 88:9902, 1991). Some of these receptors transduce the signal at the cell surface to the cytoplasm through the activation of a tyrosine kinase domain in the cytoplasmic portion of the receptor (eg., CSF1, c-kit, STK-1/FLT3/FLK2-) (Boyle, W. J., Current Opinion in Oncology, 4:156, 1992, Chiba, T., et al., Nature, 362:646, 1993, Schlessinger, J., et al., Neuron, 9:383, 1992, Ullrich, A. and Schlessinger, J., Cell, 61:203, 1990). Another group of hematopoietic receptors lack intrinsic kinase catalytic domains (e.g., IL-3, GM-CSF, G-CSF, and EPO receptors) (Miyajima, A., et at., Blood, 82:1960, 1993, Fukunaga, R., et al., EMBO, 10:2855, 1991, Wojchowski, D. M., et al., Stem Cells, 11:381, 1993), however, upon binding of their ligands, these receptors activate protein tyrosine phosphorylation of second messengers and the subsequent signal pathways to the cell's nucleus (Kishimoto, T. et al., Science, 258:593, 1992, Stahl, N., et at., Cell, 74:587, 1993).

Tyrosine kinases often play pivotal rules in the proliferation and differentiation of many cell types. Many growth factor receptors contain a tyrosine kinase domain as part of their cytoplasmic tail such that binding by ligand directly activates their tyrosine kinase activity. However, many other receptors do not contain a tyrosine kinase domain in their cytoplasmic tail. Addition of ligand to many cell types expressing these receptors still results in increased levels of phosphotyrosine. The JAK family, a series of related intracellular tyrosine kinases, has recently been shown to link these receptors and other members of the signal transduction pathway.

The JAK family members contain the highly conserved catalytic domain found in other tyrosine kinases (Firmbach-Kraft, I., et al., Oncogene, 5:1329, 1990, Hanks, S. K., et al., Methods in Enzymology, 200:38, 1991, Hunter, T., Methods in Enzymology, 200:3, 1991, Wilks, A. F., Proc. Natl. Acad. Sci. USA, 86:1603, 1989). One feature that distinguishes the JAK family from other tyrosine kinases is that each member also contains a second kinase-like domain of unknown function (Harpur, A. G., et al, Oncogene, 7:1347, 1992). In addition, the JAK family members do not contain SH2 or SH3 domains, signal peptide sequences, or transmembrane domains, and are localized in the cytoplasm (Wilks, A. F., et al, Molecular and Cellular Biology, 11:2057, 1991).

Three members of the JAK family, JAK1, JAK2, an TYK-2, have been functionally described. The first two members were isolated by a PCR approach utilizing degenerate oligonucleotide primers and TYK-2 was isolated by screening with a tyrosine kinase probe at reduced stringency (Silvennoinen, O. et al., Proc. Natl. Acad. Sci. USA, 90:8429, 1993). To date, the JAK family members have been shown to be involved with the receptors for numerous cytokines and growth factors, including IFNαβ and γ, IL-3, GM-CSF, EPO, GH, CNTF, LIF, OSM, IL-6, and PRL (Argetsinger, L. S., et al., Cell, 74:237, 1993, Luttichen, C., et al., Science, 263:89, 1994, Muller, M., et al., Nature, 366:129, 1993, Stahl, N., et al., Science, 263:92, 1994, Velazquez, L., et al., Cell, 70:313, 1992, Watling, D., et al., Nature, 366:166, 1993, Witthuhn, B. A., et al., Cell, 74:227, 1993, Rui, H., et al., The Journal of Biological Chemistry, 269:5364, 1994). In most cases, the JAK family members seem to associate with the proximal membrane portion of the cytoplasmic domain of the receptor (e.g., gp130, LIFRβ, EPO) as a constitutive complex (Narazaki, M., et al., Proc. Natl. Acad. Sci. USA, 91:2285, 1994). In other cases, the association is not evident until ligand binding takes place (e.g., GH receptor). In either case, ligand binding results in increased JAK kinase activity.

The first evidence for the functional role of JAK family members was provided when it was shown that TYK-2 could rescue IFNα/β responsiveness in a cell line that had become unresponsive. In a similar fashion, JAK1 and JAK2 have been shown to function in the signalling of interferon pathways, as well. In each case, two different JAKS have been found to act with each type of IFN receptor; JAK2 and TYK-2 are involved exclusively with IFNγ and IFNα/β, respectively, whereas JAK1 is involved with both receptors. Stimulation of the IFNα/β receptors by the binding of their respective ligands results in the phosphorylation of p91 (STAT1) and p113 (STAT2), which are subunits of the ISGF3 transcription complex that binds the interferon-stimulated response element (ISRE). In the case of IFNγ, p91 alone is pbosphorylated, which then binds gamma-activated sequences (GAS) of IFNγ activated genes (Shual, K., et at., Nature, 366:580, 1993, Ihle, J. N., et al., Trends in Biological Science, 19:222, 1994). Because each of these receptors associate with JAK1 it has been suggested that JAK1 may directly phosphorylate p91 (Loh, J. E., et al., Molecular and Cellular Biology, 14:2170, 1994). It has been recently reported that IL-6 (via gp130), which associates with JAK1 and TYK-2, also triggers the activation of p91 (STAT1) (Yuan, J., et al., Molecular and Cellular Biology, 14:1657, 1994). The EPO, and IL-3 receptors are also believed to similarly activate STAT family members. As all of the hematopoietic receptors seem to utilize certain common proteins in their signal transduction pathways, some of the specificity of the pathways may reside in the cell specific expression of STAT family members and their activation by JAK family members (Metcalf, D., Blood, 82:3515, 1993, Darnell, J. E., et at., Science, 264:1415, 1994).

Additional pairs of JAK family members have been found to associate with other receptors (e.g., CNTF, LIF, IL-6) and both become tyrosine phosphorylated upon the stimulation of these receptors (Silvennoinen, O., et al., Nature, 366:583, 1993). It is possible that reciprocal tyrosine phosphorylation between two JAKs is required as phosphorylation of both associating JAKs is necessary for signal transduction to occur. Thus, JAK family members may act in pairs, possibly as heterodimers.

Recently a Drosophila JAK family member, hop, was shown to be required maternally for normal embryonic development (Binari, et al., Genes & Dev., 8:300, 1994). Mutants in hop showed defects in the expression of several paired-role and segment polarity genes, implicating it in the control of transcription of these genes, a role that could be analogous to the defect in TYK-2, JAK1, or JAK2 in several cell lines that lost IFN responsiveness.

The present invention provides a new member of the JAK protein tyrosine kinase family. The structural homology between the JAK3 of this invention and the other members of JAK family, indicates that JAK3 is a new member of this family of non-receptor tyrosine kinases. In analogy to the other JAK family members, JAK3 is likely involved in the signal transduction pathway of already characterized receptors which lack intrinsic activity. Because of its strong expression in the fraction enriched for CD34+ normal human bone marrow, JAK3 is likely to be important in stem/progenitor cell growth, and/or survival, and/or differentiation, by transducing the signals of receptors which modulate these processes. In addition, JAK3 may also be involved in the signal transduction pathways of any of several already known or as yet unidentified non-tyrosine kinase receptors with which the other JAK members have not been shown to associate (e.g. IL-2, IL-4, IL-11).

SUMMARY OF THE INVENTION

The present invention provides a novel protein tyrosine kinase JAK3, a polynucleotide sequence which encodes JAK3 and antibodies which are immunoreactive with the protein. The amino acid sequence of JAK3 indicates that it is a new member of the JAK family of non-receptor tyrosine kinases. JAK3 is highly expressed in the CD34+/lin- fraction in normal human bone marrow which is highly enriched in hematopoietic stem/progenitor cells. Therefore, by analogy to other JAK family members, it is likely that JAK3 plays a role in the growth factor modulated differentiation/proliferation/survival of the stem/progenitor cells.

JAK3 is expressed in mammalian tissues, and particularly human tissue. For example, JAK3 is expressed in human hematopoietic tissues, (e.g., bone marrow), and non-hematopoietic human tissues, such as liver, lung, kidney, spleen and intestine. In particular, JAK-3 is most highly expressed in the stem/progenitor cell enriched fraction of normal human bone marrow. JAK-3 is further expressed in a wide range of leukemic derived cell lines including AMLs (KG1, TF-1, HEL), B lineage ALLs (PB697, Nalm-16, and Nalm-6), and T-ALLs (Molt-16, and Molt-3).

JAK3 is localized to chromosome 19, band p12-13.1, where another member of the JAK family, TYK-2 is co-localized. Several other genes containing tyrosine kinase domains are tandemly linked and may have evolved by cis duplications. Examples include the genes for the receptors of c-fms (CSF-1 receptor) and PDGFR β on chromosome 5 bands q31-q33, c-kit and PDGFR α on chromosome 4 bands q11-q13, as well as FLT1 and STK-1/FLT3/FLK2 on chromosome 13 band q12.

In another embodiment, the invention provides a method for ameliorating a cell proliferative disorder associated with JAK-3. In another embodiment, the invention provides a method for stimulating stem/progenitor cell proliferation/survival and differentiation in vitro.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows nucleotide (cDNA) and predicted amino acid sequence of JAK3, (SEQ ID NO:1 and NO:2, respectively. The predicted amino acids are numbered on the left of each column with the nucleotides of the largest open reading frame numbered on the right, starting with the initiating methionine of JAK3. The conserved tyrosine kinase motifs GXGXXG and DFG are shown boxed. The highly conserved peptide regions chosen for the design of the degenerate oligo nucleotides used for the initial PCR VHRDLA & DVWSFG! are shown in ovals. Also shown are 167 bases of the 5' untranslated region and 394 bases of the 3' untranslated region. Potential polyadenylation signals are underlined.

FIG. 2 (SEQ ID NO:5-9) shows an amino acid comparison between JAK3 and other JAK family members. The numbering system begins with the initiating methionine of the JAK family members. The numbering system does not take into account the insertion of gaps and, therefore, should be only regarded as a relative measure of location. The consensus sequence (CONS) is derived if three out of four JAK family members have the identical amino acid in that position. The conserved kinase domain of all tyrosine kinases, JAK homology domain 1 (JH1), and the putative second kinase domain, JAK homology domain 2 (JH2) are designated with arrows. With the exception of JAK2, (murine), all sequences are human.

FIG. 3 (SEQ ID NO:10-12) shows an amino acid comparison between human JAK3 and rat JAK3. The amino acid residues of each member are numbered beginning with the initiating methionine. The consensus sequence (CONS) of the two JAK family members are listed below the compared sequences when identical. Pluses (+) denote conservative amino acid substitutions.

FIG. 4a shows an RNAse protection analysis of JAK3 expression in human leukemia derived cell lines and normal bone marrow. On the left side the undigested full-length JAK3 and actin probes are denoted. The RNA sources are labeled above each lane. To show the specificity of the protected bands, reactions with no RNA and with tRNA (tRNA) were also conducted. The position of the protected JAK3 and actin species are denoted on the right side.

FIG. 4b shows a northern blot analysis of JAK3 expression in human leukemia derived cell lines. (Upper half) A Northern blot of poly A+ RNA from the leukemia-derived cell lines noted above each lane was hybridized with a randomly primed ³² P α-dCTP labeled probe corresponding to a 1.8 kb fragment of JAK3. The relative mobilities of the 28S ribosomal RNA and RNA markers are denoted on the right. The JAK3 band is indicated by an arrow. (Lower half) The blot was stripped and reprobed with actin.

FIG. 4c shows a northern blot analysis of JAK3 expression in non-hematopoietic tissues. A multiple tissue Northern blot (Clonetech, Palo Alto, Calif.) containing 2 ug of poly A+ RNA from human heart, brain, placenta, lung, live, skeletal muscle, kidney, and pancreas was hybridized with the same probe as in FIG. 4b. The relative mobilities of the RNA markers are denoted on the left. The JAK3 band is indicated by an arrow.

FIG. 5a shows an RNAse protection analysis of JAK3 expression in normal bone marrow fractions. On the left side the undigested, full-length, JAK3 and actin probes are denoted. The RNA sources are labeled above each lane. To show the specificity of the protected bands, reactions with no RNA (None) and with tRNA (tRNA) were also conducted. The protected JAK3 and actin species are denoted on the right side. The unlabelled band that migrates between the JAK3 and actin bands is present in all lanes, including the no RNA and tRNA lanes, and is a result of incomplete digestion of the probe.

FIG. 5b shows a phosphorimage analysis of bone marrow fractions. Following exposure to film, the gel shown in FIG. 5a was exposed to a phosphorimage screen (Molecular Dynamics, Sunnyvale, Calif.). Bands were quantified using the ImageQuantify program and normalized relative to the actin signals.

FIG. 6a shows fluorescence in situ hybridization (FISH) used to identify the localization of JAK3. A plasmid containing approximately 80 kb of the JAK3 genomic DNA was labelled with biotin-14 dATP and hybridized to chromosome spreads made from normal human male lymphocytes cultured with BrdU. Analysis of 36 metaphase cells showed 20 cells (56%) had at least one pair of signals (involving both chromatids of a single chromosome), an example of which is shown. Paired signals are indicated by arrows.

FIG. 6b shows G-banding of chromosome spreads. The same metaphase spread shown in FIG. 6a was G-banded by fluorescence plus Giemsa (FPG) after hybridization, photographed and aligned with the color FISH slides. The position of the paired FISH signals on the G-banded chromosomes are indicated by arrows.

FIG. 6c shows an ideogram of human chromosome 19, revealing localization of JAK3 to 19p12-13.1. Each dot represents a paired signal seen on metaphase chromosomes. Signals clearly located on a single band are diagrammed to the right of the ideogram; those which could not be sublocalized to a single band are assigned to regions diagrammed to the left (brackets).

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides a novel protein tyrosine kinase, JAK3, and a polynucleotide sequence encoding JAK3 polypeptide. The amino acid sequence of JAK3 indicates that it is a new member of the JAK family of non-receptor tyrosine kinases. In normal human bone marrow, JAK3 is highly expressed in the CD34+/lin- fraction which is enriched in hematopoietic stem/progenitor cells. As JAK kinases have been shown to be involved in the signal transduction pathways of various hematopoietic growth factors, it is likely that JAK3 plays a role in the growth factor modulated differentiation/proliferation/survival of hematopoietic stem/progenitor cells.

In a first embodiment, the invention provides a substantially pure JAK3 polypeptide consisting essentially of the amino acid sequence of SEQ ID NO:2. The full-length JAK3 polypeptide sequence has 1082 amino acids with a molecular weight of approximately 121 kD. JAK3 has 48% identity and 67% similarity with JAK2 (murine), 41% identity and 61% similarity with JAK1 (human), and 40% identity and 60% similarity with TYK-2 (human). Comparison of human JAK3 with the rat JAK3 shows 77% identity and 84% similarity (Takahashi, T. and Shirasawa, T., FEBS Letters, 342:124, 1994).

The term "substantially pure" or "isolated" as used herein, refers to JAK3 polypeptide which is substantially flee of other proteins, lipids, carbohydrates, nucleic acids, or other materials with which it is naturally associated. One skilled in the art can purify JAK3 using standard techniques for protein purification. The substantially pure polypeptide will yield a single major band on a non-reducing polyacrylamide gel. The purity of the JAK3 polypeptide can also be determined by amino-terminal amino acid sequence analysis.

The invention includes a functional polypeptide, JAK3, and functional fragments thereof. As used herein, the term "functional polypeptide" refers to a polypeptide which possesses a biological function or activity which is identified through a defined functional assay and which is associated with a particular biologic, morphologic, or phenotypic alteration in the cell. Functional fragments of the JAK3 polypeptide, includes fragments of JAK3 as long as the activity, e.g., protein tyrosine kinase activity, of JAK3 remains. Smaller peptides containing the biological activity of JAK3 are included in the invention. The biological function, for example, can vary from a polypeptide fragment as small as an epitope to which an antibody molecule can bind to a large polypeptide which is capable of participating in the characteristic induction or programming of phenotypic changes within a cell. An enzymatically functional JAK3 polypeptide or fragment thereof possesses JAK3 tyrosine kinase activity. A "functional polynucleotide" denotes a polynucleotide which encodes a functional polypeptide as described herein.

Minor modifications of the JAK3 primary amino acid sequence may result in proteins which have substantially equivalent activity as compared to the JAK3 polypeptide described herein. Such modifications may be deliberate, as by site-directed mutagenesis, or may be spontaneous. All of the polypeptides produced by these modifications are included herein as long as the tyrosine kinase activity of JAK3 is present. Further, deletion of one or more amino acids can also result in a modification of the structure of the resultant molecule without significantly altering its kinase activity. This can lead to the development of a smaller active molecule which may have broader utility. For example, it is possible to remove amino or carboxyl terminal amino acids which may not be required for JAK3 kinase activity.

The JAK3 polypeptide of the invention also includes conservative variations of the polypeptide sequence. The term "conservative variation" as used herein denotes the replacement of an amino acid residue by another, biologically similar residue. Examples of conservative variations include the substitution of one hydrophobic residue such as isoleucine, valine, leucine or methionine for another, or the substitution of one polar residue for another, such as the substitution of arginine for lysine, glutamic for aspartic acids, or glutamine for asparagine, and the like. The term "conservative variation" also includes the use of a substituted amino acid in place of an unsubstituted parent amino acid provided that antibodies raised to the substituted polypeptide also immunoreact with the unsubstituted polypeptide.

The invention also provides an isolated polynucleotide sequence consisting essentially of a polynucleotide sequence encoding a polypeptide having the amino acid sequence of SEQ ID NO:2. As used herein, "polynucleotide" refers to a polymer of deoxyribonucleotides or ribonucleotides, in the form of a separate fragment or a larger construct. The term "isolated" as used herein includes polynucleotides substantially free of other nucleic acids, proteins, lipids, carbohydrates or other materials with which it is naturally associated. Polynucleotide sequences of the invention include DNA, cDNA and RNA sequences which encode JAK3. It is understood that all polynucleotides encoding all or a portion of JAK3 are also included herein, as long as they encode a polypeptide with JAK3 kinase activity. Such polynucleotides include naturally occurring, synthetic, and intentionally manipulated polynucleotides. For example, JAK3 polynucleotide may be subjected to site-directed mutagenesis. The polynucleotide sequence for JAK3 also includes antisense sequences. The polynucleotides of the invention include sequences that are degenerate as a result of the genetic code. There are 20 natural amino acids, most of which are specified by more than one codon. Therefore, all degenerate nucleotide sequences are included in the invention as long as the amino acid sequence of JAK3 polypeptide encoded by the nucleotide sequence is functionally unchanged. In addition, the invention also includes a polynucleotide consisting essentially of a polynucleotide sequence encoding a polypeptide having an amino acid sequence of SEQ ID NO:2 and having at least one epitope for an antibody immunoreactive with JAK3 polypeptide.

Specifically disclosed herein is a cDNA sequence which encodes JAK3 which comprising a 3,807 base pair (bp) predicted coding region for JAK3, 167 base pairs of 5' untranslated and 394 base pairs of 3' untranslated sequence (SEQ. ID NO:1). The cDNA includes an open reading frame of 3,246 base pairs encoding a protein of about 1082 amine acids, having a molecular weight of about 121 kD. The putative initiating methionine shows the strongest homology with the Kozak consensus sequence (Kozak, M., Nucleic Acids Research, 15:8125, 1987). At the 3' end, an in frame stop codon defines the C-terminus of the JAK3 protein at position 3242.

The polynucleotide encoding JAK3 includes the nucleotide sequence in FIG. 1 (SEQ ID NO:1), as well as nucleic acid sequences complementary to that sequence. A complementary sequence may include an antisense nucleotide. When the sequence is RNA, the deoxynucleotides A, G, C, and T of FIG. 1 are replaced by ribonucleotides A, G, C, and U, respectively. Also included in the invention are fragments of the above-described nucleic acid sequences that are at least 15 bases in length, which is sufficient to permit the fragment to selectively hybridize to DNA that encodes the protein of FIG. 1 (SEQ ID NO:2) under physiological conditions.

DNA sequences of the invention can be obtained by several methods. For example, the DNA can be isolated using hybridization techniques which are well known in the art. These include, but are not limited to: 1) hybridization of genomic or cDNA libraries with probes to detect homologous nucleotide sequences; 2) antibody screening of expression libraries to detect cloned DNA fragments with shared structural features; and 3) PCR amplification of a desired nucleotide sequence using oligonucleotide primers.

Preferably the JAK3 polynucleotide of the invention is derived from a mammalian organism, and most preferably from human. Screening procedures which rely on nucleic acid hybridization make it possible to isolate any gene sequence from any organism, provided the appropriate probe is available. Oligonucleotide probes, which correspond to a part of the sequence encoding the protein in question, can be synthesized chemically. This requires that short, oligopeptide stretches of amine acid sequence must be known. The DNA sequence encoding the protein can be deduced from the genetic code, however, the degeneracy of the code must be taken into account. It is possible to perform a mixed addition reaction when the sequence is degenerate. This includes a heterogeneous mixture of denatured double-stranded DNA. For such screening, hybridization is preferably performed on either single-stranded DNA or denatured double-stranded DNA. Hybridization is particularly useful in the detection of cDNA clones derived from sources where an extremely low mount of mRNA sequences relating to the polypeptide of interest are present. In other words, by using stringent hybridization conditions directed to avoid non-specific binding, it is possible, for example, to allow the autoradiographic visualization of a specific cDNA clone by the hybridization of the target DNA to that single probe in the mixture which is its complete complement (Wallace, et al., Nucl. Acid Res., 9:879, 1981).

The development of specific DNA sequences encoding JAK3 can also be obtained by: 1) isolation of double-stranded DNA sequences from the genomic DNA; 2) chemical manufacture of a DNA sequence to provide the necessary codons for the polypeptide of interest; and 3) in vitro synthesis of a double-stranded DNA sequence by reverse transcription of mRNA isolated from a eukaryotic donor cell. In the latter case, a double-stranded DNA complement of mRNA is eventually formed which is generally referred to as cDNA.

Of the three above-noted methods for developing specific DNA sequences for use in recombinant procedures, the isolation of genomic DNA isolates is the least common. This is especially true when it is desirable to obtain the microbial expression of mammalian polypeptides due to the presence of introns.

The synthesis of DNA sequences is frequently the method of choice when the entire sequence of amino acid residues of the desired polypeptide product is known. When the entire sequence of amino acid residues of the desired polypeptide is not known, the direct synthesis of DNA sequences is not possible and the method of choice is the synthesis of cDNA sequences. Among the standard procedures for isolating cDNA sequences of interest is the formation of plasmid- or phage-carrying cDNA libraries which are derived from reverse transcription of mRNA which is abundant in donor cells that have a high level of genetic expression. When used in combination with polymerase chain reaction technology, even rare expression products can be cloned. In those cases where significant portions of the amino acid sequence of the polypeptide are known, the production of labeled single or double-stranded DNA or RNA probe sequences duplicating a sequence putatively present in the target cDNA may be employed in DNA/DNA hybridization procedures which are carried out on cloned copies of the cDNA which have been denatured into a single-stranded form (Jay, et al., Nucl. Acid Res., 11:2325, 1983).

A preferred method for obtaining genomic DNA for example is Polymerase Chain Reaction (PCR), which relies on an in vitro method of nucleic acid synthesis by which a particular segment of DNA is specifically replicated. Two oligonucleotide primers that flank the DNA fragment to be amplified are utilized in repeated cycles of heat denaturation of the DNA, annealing of the primers to their complementary sequences, and extension of the annealed primers with DNA polymerase. These primers hybridize to opposite strands of the target sequence and are oriented so that DNA synthesis by the polymerase proceeds across the region between the primers. Since the extension products themselves are also complementary to and capable of binding primers, successive cycles of amplification essentially double the amount of the target DNA synthesized in the previous cycle. The result is an exponential accumulation of the specific target fragment, approximately 2^(n), where n is the number of cycles of amplification performed (see PCR Protocols, Eds. Innis, et al., Academic Press, Inc., 1990, incorporated herein by reference).

A cDNA expression library, such as lambda gt11, can be screened indirectly for JAK3 peptides having at least one epitope, using antibodies specific for JAK3. Such antibodies can be either polyclonally or monoclonally derived and used to detect expression product indicative of the presence of JAK3 cDNA. The polynucleotide sequence for JAK3 also includes sequences complementary to the polynucleotide encoding JAK3 (antisense sequences). Antisense nucleic acids are DNA or RNA molecules that are complementary to at least a portion of a specific mRNA molecule (Weintraub, Scientific American, 262:40, 1990). The invention embraces all antisense polynucleotides capable of inhibiting production of JAK3 polypeptide. In the cell, the antisense nucleic acids hybridize to the corresponding mRNA, forming a double-stranded molecule. The antisense nucleic acids may interfere with the translation of the mRNA since the cell will not translate a mRNA that is double-stranded, or alternatively, the double-stranded mRNA is degraded. Antisense oligomers of about 15 nucleotides are preferred, since they are easily synthesized, small enough to enter the cell, and are less likely to cause problems than larger molecules when introduced into the target JAK3-producing cell. The use of antisense methods to inhibit the translation of genes is well known in the art (Marcus-Sakura, Anal. Biochem., 172:289, 1988).

In addition, ribozyme nucleotide sequences for JAK3 are included in the invention. Ribozymes are RNA molecules possessing the ability to specifically cleave other single-stranded RNA in a manner analogous to DNA restriction endonucleases. Through the modification of nucleotide sequences which encode these RNAs, it is possible to engineer molecules that recognize specific nucleotide sequences in an RNA molecule and cleave it (Cech, /J. Amer. Med. Assn., 260:3030, 1988). A major advantage of this approach is that, because they are sequence-specific, only mRNAs with particular sequences are inactivated.

There are two basic types of ribozymes namely, tetrahymena-type (Hasselhoff, Nature, 334:585, 1988) and "hammerhead"-type. Tetrahymena-type ribozymes recognize sequences which are four bases in length, while "hammerhead"-type ribozymes recognize base sequences 11-18 bases in length. The longer the recognition sequence, the greater the likelihood that sequence will occur exclusively in the target mRNA species. Consequently, hammerhead-type ribozymes are preferable to tetrahymena-type ribozymes for inactivating a specific mRNA species and 18-based recognition sequences are preferable to shorter recognition sequences.

DNA sequences encoding JAK3 can be expressed in vitro by DNA transfer into a suitable host cell. "Host cells" are cells in which a vector can be propagated and its DNA expressed. The term also includes any progeny of the subject host cell. It is understood that all progeny may not be identical to the parental cell since there may be mutations that occur during replication. However, such progeny are included when the term "host cell" is used. Methods of stable transfer, meaning that the foreign DNA is continuously maintained in the host, are known in the art.

In the present invention, the JAK3 polynucleotide sequences may be inserted into a recombinant expression vector. The term "recombinant expression vector" refers to a plasmid, virus or other vehicle known in the art that has been manipulated by insertion or incorporation of the JAK3 genetic sequences. Such expression vectors contain a promoter sequence which facilitates the efficient transcription of the inserted genetic sequence of the host. The expression vector typically contains an origin of replication, a promoter, as well as specific genes which allow phenotypic selection of the transformed cells. Vectors suitable for use in the present invention include, but are not limited to the T7-based expression vector for expression in bacteria (Rosenberg, et al., Gene, 56:125, 1987), the pMSXND expression vector for expression in mammalian cells (Lee and Nathans, J. Biol. Chem., 263:3521, 1988) and baculovirus-derived vectors for expression in insect cells. The DNA segment can be present in the vector operably linked to regulatory elements, for example, a promoter (e.g., T7, metallothionein I, or polyhedrin promoters).

Polynucleotide sequences encoding JAK3 can be expressed in either prokaryotes or eukaryotes. Hosts can include microbial, yeast, insect and mammalian organisms. Methods of expressing DNA sequences having eukaryotic or viral sequences in prokaryotes are well known in the art. Biologically functional vital and plasmid DNA vectors capable of expression and replication in a host are known in the art. Such vectors are used to incorporate DNA sequences of the invention.

Methods which are well known to those skilled in the art can be used to construct expression vectors containing the JAK3 coding sequence and appropriate transcriptional/translational control signals. These methods include in vitro recombinant DNA techniques, synthetic techniques, and in vivo recombination/genetic techniques. See, for example, the techniques described in Maniatis, et al., 1989 Molecular Cloning A Laboratory Manual, Cold Spring Harbor Laboratory, N.Y.

A variety of host-expression vector systems may be utilized to express the JAK3 coding sequence. These include but are not limited to microorganisms such as bacteria transformed with recombinant bacteriophage DNA, plasmid DNA or cosmid DNA expression vectors containing the JAK3 coding sequence; yeast transformed with recombinant yeast expression vectors containing the JAK3 coding sequence; plant cell systems infected with recombinant virus expression vectors (e.g., cauliflower mosaic virus, CaMV; tobacco mosaic virus, TMV) or transformed with recombinant plasmid expression vectors (e.g., Ti plasmid) containing the JAK3 coding sequence; insect cell systems infected with recombinant virus expression vectors (e.g., baculovirus) containing the JAK3 coding sequence; or animal cell systems infected with recombinant virus expression vectors (e.g., retroviruses, adenovirus, vaccinia virus) containing the JAK3 coding sequence, or transformed animal cell systems engineered for stable expression. Since JAK3 has not been confirmed to contain carbohydrates, both bacterial expression systems as well as those that provide for translational and post-translational modifications may be used; e.g., mammalian, insect, yeast or plant expression systems.

Depending on the host/vector system utilized, any of a number of suitable transcription and translation elements, including constitutive and inducible promoters, transcription enhancer elements, transcription terminators, etc. may be used in the expression vector (see e.g., Bitter, et al., 1987, Methods in Enzymology, 153:516-544). For example, when cloning in bacterial systems, inducible promoters such as pL of bacteriophage γ, plac, ptrp, ptac (ptrp-lac hybrid promoter) and the like may be used. When cloning in mammalian cell systems, promoters derived from the genome of mammalian cells (e.g., metallothionein promoter) or from mammalian viruses (e.g., the retrovirus long terminal repeat; the adenovirus late promoter; the vaccinia virus 7.5K promoter) may be used. Promoters produced by recombinant DNA or synthetic techniques may also be used to provide for transcription of the inserted JAK3 coding sequence.

In bacterial systems a number of expression vectors may be advantageously selected depending upon the use intended for the expressed. For example, when large quantities of JAK3 are to be produced, vectors which direct the expression of high levels of fusion protein products that are readily purified may be desirable. Those which are engineered to contain a cleavage site to aid in recovering are preferred. Such vectors include but are not limited to the E. coli expression vector pUR278 (Ruther, et al., EMBO J., 2:1791, 1983), in which the JAK3 coding sequence may be ligated into the vector in frame with the lac Z coding region so that a hybrid -lac Z protein is produced; pIN vectors (Inouye and Inouye, Nucleic Acids Res., 13:3101, 1985; Van Heeke and Schuster, J. Biol. Chem. 264:5503, 1989) and the like.

In yeast, a number of vectors containing constitutive or inducible promoters may be used. For a review see, Current Protocols in Molecular Biology, Vol. 2, 1988, Ed. Ausubel, et al., Greene Publish. Assoc. & Wiley Interscience, Ch. 13; Grant, et al., 1987, Expression and Secretion Vectors for Yeast, in Methods in Enzymology, Eds. Wu and Grossman, 31987, Acad. Press, N.Y., Vol. 153, pp.516-544; Glover, 1986, DNA Cloning, Vol. II, IRL Press, Wash., D.C., Ch. 3; and Bitter, 1987, Heterologous Gene Expression in Yeast, Methods in Enzymology, Eds. Berger and Kimmel, Acad. Press, N.Y., Vol. 152, pp. 673-684; and The Molecular Biology of the Yeast Saccharomyces, 1982, Eds. Strathern, et al., Cold Spring Harbor Press, Vols. I and II. A constitutive yeast promoter such as ADH or LEU2 or an inducible promoter such as GAL may be used (Cloning in Yeast, Ch. 3, R. Rothstein In: DNA Cloning Vol. 11, A Practical Approach, Ed. D. M. Glover, 1986, IRL Press, Wash., D.C.). Alternatively, vectors may be used which promote integration of foreign DNA sequences into the yeast chromosome.

In cases where plant expression vectors are used, the expression of the JAK3 coding sequence may be driven by any of a number of promoters. For example, viral promoters such as the 35S RNA and 19S RNA promoters of CaMV (Brisson, et al., Nature, 310:511, 1984), or the coat protein promoter to TMV (Takamatsu, et al., EMBO J., 6:307, 1987) may be used; alternatively, plant promoters such as the small subunit of RUBISCO (Coruzzi, et al., EMBO J., 3:1671-1680, 1984; Broglie, et al., Science, 224:838, 1984); or heat shock promoters, e.g., soybean hsp17.5-E or hsp17.3-B (Gurley, et al., Mol. Cell. Biol., 6:559, 1986) may be used. These constructs can be introduced into plant cells using Ti plasmids, Ri plasmids, plant virus vectors, direct DNA transformation, microinjection, electroporation, etc. For reviews of such techniques see, for example, Weissbach and Weissbach, 1988, Methods for Plant Molecular Biology, Academic Press, N.Y., Section VIII, pp. 421-463; and Grierson and Corey, 1988, Plant Molecular Biology, 2d Ed., Blackie, London, Ch. 7-9.

An alternative expression system which could be used to express is an insect system. In one such system, Autographa californica nuclear polyhedrosis virus (AcNPV) is used as a vector to express foreign genes. The virus grows in Spodoptera frugiperda cells. The JAK3 coding sequence may be cloned into non-essential regions (for example the polyhedrin gene) of the virus and placed under control of an AcNPV promoter (for example the polyhedrin promoter). Successful insertion of the JAK3 coding sequence will result in inactivation of the polyhedrin gene and production of non-occluded recombinant virus (i.e., virus lacking the proteinaceous coat coded for by the polyhedrin gene). These recombinant viruses are then used to infect Spodoptera frugiperda cells in which the inserted gene is expressed. (e.g., see Smith, et al., J. Viol., 46:584, 1983; Smith, U.S. Pat. No. 4,215,051).

Eukaryotic systems, and preferably mammalian expression systems, allow for proper post-translational modifications of expressed mammalian proteins to occur. Eukaryotic cells which possess the cellular machinery for proper processing of the primary transcript, glycosylation, phosphorylation, and advantageously, secretion of the gene product may be used as host cells for the expression of JAK3. Mammalian cell lines may be preferable. Such host cell lines may include but are not limited to CHO, VERO, BHK, HeLa, COS, MDCK, -293, and WI38.

Mammalian cell systems which utilize recombinant viruses or viral elements to direct expression may be engineered. For example, when using adenovirus expression vectors, the JAK3 coding sequence may be ligated to an adenovirus transcription/translation control complex, e.g., the late promoter and tripartite leader sequence. This chimeric gene may then be inserted in the adenovirus genome by in vitro or in vivo recombination. Insertion in a non-essential region of the viral genome (e.g., region E1 or E3) will result in a recombinant virus that is viable and capable of expressing the protein in infected hosts (e.g., see Logan and Shenk, Proc. Natl. Acad. Sci. USA 81:3655, 1984). Alternatively, the vaccinia virus 7.5K promoter may be used. (e.g., see, Mackett, et al., Proc. Natl. Acad. Sci. USA, 79:7415, 1982; Mackett, et al., J. Virol., 49:857, 1984; Panicali, et al., Proc. Natl. Acad. Sci. USA, 79:4927, 1982). Of particular interest are vectors based on bovine papilloma virus which have the ability to replicate as extrachromosomal elements (Sarver, et al., Mol. Cell. Biol., 1:486, 1981). Shortly after entry of this DNA into mouse cells, the plasmid replicates to about 100 to 200 copies per cell. Transcription of the inserted cDNA does not require integration of the plasmid into the host's chromosome, thereby yielding a high level of expression. These vectors can be used for stable expression by including a selectable marker in the plasmid, such as, for example, the neo gene. Alternatively, the retroviral genome can be modified for use as a vector capable of introducing and directing the expression of the JAK3 gene in host cells (Cone and Mulligan, Proc. Natl. Acad. Sci. USA, 81:6349, 1984). High level expression may also be achieved using inducible promoters, including, but not limited to, the metallothionine IIA promoter and heat shock promoters.

For long-term, high-yield production of recombinant proteins, stable expression is preferred. Rather than using expression vectors which contain viral origins of replication, host cells can be transformed with the JAK3 cDNA controlled by appropriate expression control elements (e.g., promoter, enhancer, sequences, transcription terminators, polyadenylation sites, etc.), and a selectable marker. The selectable marker in the recombinant plasmid confers resistance to the selection and allows cells to stably integrate the plasmid into their chromosomes and grow to form foci which in turn can be cloned and expanded into cell lines. For example, following the introduction of foreign DNA, engineered cells may be allowed to grow for 1-2 days in an enriched media, and then are switched to a selective media. A number of selection systems may be used, including but not limited to the herpes simplex virus thymidine kinase (Wigler, et al., Cell, 11:223, 1977), hypoxanthine-guanine phosphoribosyltransferase (Szybalska and Szybalski, Proc. Natl. Acad. Sci. USA, 48:2026, 1962), and adenine phosphoribosyltransferase (Lowy, et al., Cell, :22:817, 1980) genes can be employed in tk⁻, hgprt⁻ or aprt⁻ cells respectively. Also, antimetabolite resistance can be used as the basis of selection for dhfr, which confers resistance to methotrexate (Wigler, et al., Natl. Acad. Sci. USA, 77:3567, 1980; O'Hare, et al., Proc. Natl. Acad. Sci. USA, 78:1527, 1981); gpt, which confers resistance to mycophenolic acid (Mulligan and Berg, Proc. Natl. Acad. Sci. USA, 78:2072, 1981; neo, which confers resistance to the aminoglycoside G418 (Colberre-Garapin, et al., J. Mol. Biol., 150:1, 1981); and hygro, which confers resistance to hygromycin (Santerre, et al., Gene, 30:147, 1984) genes. Recently, additional selectable genes have been described, namely trpB, which allows cells to utilize indole in place of tryptophan; hisD, which allows cells to utilize histinol in place of histidine (Hartman and Mulligan, Proc. Natl. Acad. Sci. USA, 85:8047, 1988); and ODC (ornithine decarboxylase) which confers resistance to the ornithine decarboxylase inhibitor, 2-(difluoromethyl)-DL-ornithine, DFMO (McConlogue L., 1987, In: Current Communications in Molecular Biology, Cold Spring Harbor Laboratory ed.).

Transformation of a host cell with recombinant DNA may be carried out by conventional techniques as are well known to those skilled in the art. Where the host is prokaryotic, such as E. coli, competent cells which are capable of DNA uptake can be prepared from cells harvested after exponential growth phase and subsequently treated by the CaCl₂ method using procedures well known in the art. Alternatively, MgCl₂ or RbCl can be used. Transformation can also be performed after forming a protoplast of the host cell if desired.

When the host is a eukaryote, such methods of transfection of DNA as calcium phosphate co-precipitates, conventional mechanical procedures such as microinjection, electroporation, insertion of a plasmid encased in liposomes, or virus vectors may be used. Eukaryotic cells can also be cotransformed with DNA sequences encoding the JAK3 of the invention, and a second foreign DNA molecule encoding a selectable phenotype, such as the herpes simplex thymidine kinase gene. Another method is to use a eukaryotic viral vector, such as simian virus 40 (SV40) or bovine papilloma virus, to transiently infect or transform eukaryotic cells and express the protein. (see for example, Eukaryotic Viral Vectors, Cold Spring Harbor Laboratory, Gluzman ed., 1982).

Isolation and purification of microbial expressed polypeptide, or fragments thereof, provided by the invention, may be carried out by conventional means including preparative chromatography and immunological separations involving monoclonal or polyclonal antibodies.

The invention includes antibodies immunoreactive with or which bind to JAK3 polypeptide or functional fragments thereof. Antibody which consists essentially of pooled monoclonal antibodies with different epitopic specificities, as well as distinct monoclonal antibody preparations are provided. Monoclonal antibodies are made from antigen containing fragments of the protein by methods well known to those skilled in the art (Kohler, et al., Nature, 256:495, 1975). The term antibody as used in this invention is meant to include intact molecules as well as fragments thereof, such as Fab and F(ab')₂, which are capable of binding an epitopic determinant on JAK3. The antibodies of the invention include antibodies which bind to the polypeptide of SEQ ID NO:2 and which bind with immunoreactive fragments of SEQ ID NO:2.

The term "antibody" as used in this invention includes intact molecules as well as fragments thereof, such as Fab, F(ab')₂, and Fv which are capable of binding the epitopic determinant. These antibody fragments retain some ability to selectively bind with its antigen or receptor and are defined as follows:

(1) Fab, the fragment which contains a monovalent antigen-binding fragment of an antibody molecule can be produced by digestion of whole antibody with the enzyme papain to yield an intact light chain and a portion of one heavy chain;

(2) Fab', the fragment of an antibody molecule can be obtained by treating whole antibody with pepsin, followed by reduction, to yield an intact light chain and a portion of the heavy chain; two Fab' fragments are obtained per antibody molecule;

(3) (Fab')₂, the fragment of the antibody that can be obtained by treating whole antibody with the enzyme pepsin without subsequent reduction; F(ab')₂ is a dimer of two Fab' fragments held together by two disulfide bonds;

(4) Fv, defined as a genetically engineered fragment containing the variable genetically fused single chain molecule.

Methods of making these fragments are known in the art. (See for example, Harlow and Lane, Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory, New York (1988), incorporated herein by reference).

As used in this invention, the term "epitope" means any antigenic determinant on an antigen to which the paratope of an antibody binds. Epitopic determinants usually consist of chemically active surface groupings of molecules such as amino acids or sugar side chains and usually have specific three dimensional structural characteristics, as well as specific charge characteristics.

Antibodies which bind to the JAK3 polypeptide of the invention can be prepared using an intact polypeptide or fragments containing small peptides of interest as the immunizing antigen. The polypeptide such as SEQ ID NO:2 used to immunize an animal can be derived from translated cDNA or chemical synthesis which can be conjugated to a carrier protein, if desired. Such commonly used carriers which are chemically coupled to the peptide include keyhole limpet hemocyanin (KLH), thyroglobulin, bovine serum albumin (BSA), and tetanus toxoid. The coupled peptide is then used to immunize the animal (e.g., a mouse, a rat, or a rabbit).

If desired, polyclonal or monoclonal antibodies can be further purified, for example, by binding to and elution from a matrix to which the polypeptide or a peptide to which the antibodies were raised is bound. Those of skill in the art will know of various techniques common in the immunology arts for purification and/or concentration of polyclonal antibodies, as well as monoclonal antibodies (See for example, Coligan, et al., Unit 9, Current Protocols in Immunology, Wiley Interscience, 1991, incorporated by reference). It is also possible to use the anti-idiotype technology to produce monoclonal antibodies which mimic an epitope. For example, an anti-idiotypic monoclonal antibody made to a first monoclonal antibody will have a binding domain in the hypervariable region which is the "image" of the epitope bound by the first monoclonal antibody.

The invention also provides a method for detecting a cell proliferative disorder associated with JAK3 in a subject, comprising contacting a target cellular component containing JAK3, with a reagent which detects JAK3. The target cell component can be nucleic acid, such as DNA or RNA, or it can be protein. When the component is nucleic acid, the reagent is a nucleic acid probe or PCR primer. When the cell component is protein, the reagent is an antibody probe. The probes can be detectably labeled, for example, with a radioisotope, a fluorescent compound, a bioluminescent compound, a chemiluminescent compound, a metal chelator, or an enzyme. Those of ordinary skill in the art will know of other suitable labels for binding to the antibody, or will be able to ascertain such, using routine experimentation.

For purposes of the invention, an antibody or nucleic acid probe specific for JAK3 may be used to detect the presence of JAK3 polypeptide (using antibody) or polynucleotide (using nucleic acid probe) in biological fluids or tissues. Oligonucleotide primers based on any coding sequence region in the JAK3 sequence are useful for amplifying DNA, for example by PCR. Any specimen containing a detectable amount of polynucleotide or antigen can be used. A preferred sample of this invention is blood or a tissue of liver, lung, kidney, spleen and intestine. Preferably the subject is human. When the cell proliferative disorder associated with JAK3 is a hematopoietic cell disorder, it may include leukemia, myelodysplasia, polyethemia vera, thrombocytosis and aplastic anemia, for example.

Monoclonal antibodies used in the method of the invention are suited for use, for example, in immunoassays in which they can be utilized in liquid phase or bound to a solid phase carrier. In addition, the monoclonal antibodies in these immunoassays can be detectably labeled in various ways. Examples of types of immunoassays which can utilize monoclonal antibodies of the invention are competitive and non-competitive immunoassays in either a direct or indirect format. Examples of such immunoassays are the radioimmunoassay (RIA) and the sandwich (immunometric) assay. Detection of the antigens using the monoclonal antibodies of the invention can be done utilizing immunoassays which are run in either the forward, reverse, or simultaneous modes, including immunohistochemical assays on physiological samples. Those of skill in the art will know, or can readily discern, other immunoassay formats without undue experimentation.

The term "immunometric assay" or "sandwich immunoassay", includes simultaneous sandwich, forward sandwich and reverse sandwich immunoassays. These terms are well understood by those skilled in the art. Those of skill will also appreciate that antibodies according to the present invention will be useful in other variations and forms of assays which are presently known or which may be developed in the future. These are intended to be included within the scope of the present invention.

Monoclonal antibodies can be bound to many different carriers and used to detect the presence of JAK3 polypeptide. Examples of well-known carriers include glass, polystyrene, polypropylene, polyethylene, dextran, nylon, amylases, natural and modified celluloses, polyacrylamides, agaroses and magnetite. The nature of the carrier can be either soluble or insoluble for purposes of the invention. Those skilled in the art will know of other suitable carriers for binding monoclonal antibodies, or will be able to ascertain such using routine experimentation.

In performing the assays it may be desirable to include certain "blockers" in the incubation medium (usually added with the labeled soluble antibody). The "blockers" are added to assure that non-specific proteins, proteases, or anti-heterophilic immunoglobulins to anti-JAK3 immunoglobulins present in the experimental sample do not cross-link or destroy the antibodies on the solid phase support, or the radiolabeled indicator antibody, to yield false positive or false negative results. The selection of "blockers" therefore may add substantially to the specificity of the assays described in the present invention.

It has been found that a number of nonrelevant (i.e., nonspecific) antibodies of the same class or subclass (isotype) as those used in the assays (e.g., IgG1, IgG2a, IgM, etc.) can be used as "blockers". The concentration of the "blockers" (normally 1-100 μg/μl) may be important, in order to maintain the proper sensitivity yet inhibit any unwanted interference by mutually occurring cross reactive proteins in the specimen.

In using a monoclonal antibody for the in vivo detection of antigen, the detectably labeled monoclonal antibody is given in a dose which is diagnostically effective. The term "diagnostically effective" means that the mount of detectably labeled monoclonal antibody is administered in sufficient quantity to enable detection of the site having the JAK3 antigen for which the monoclonal antibodies are specific.

The concentration of detectably labeled monoclonal antibody which is administered should be sufficient such that the binding to those cells having JAK3 is detectable compared to the background. Further, it is desirable that the detectably labeled monoclonal antibody be rapidly cleared from the circulatory system in order to give the best target-to-background signal ratio.

As a rule, the dosage of detectably labeled monoclonal antibody for in vivo diagnosis will vary depending on such factors as age, sex, and extent of disease of the individual. The dosage of monoclonal antibody can vary from about 0.001 mg/m² to about 500 mg/m², preferably 0.1 mg/m² to about 200 mg/m², most preferably about 0.1 mg/m² to about 10 mg/m². Such dosages may vary, for example, depending on whether multiple injections are given, tumor burden, and other factors known to those of skill in the art.

For in vivo diagnostic imaging, the type of detection instrument available is a major factor in selecting a given radioisotope. The radioisotope chosen must have a type of decay which is detectable for a given type of instrument. Still another important factor in selecting a radioisotope for in vivo diagnosis is that the half-life of the radioisotope be long enough so that it is still detectable at the time of maximum uptake by the target, but short enough so that deleterious radiation with respect to the host is minimized. Ideally, a radioisotope used for in vivo imaging will lack a particle emission, but produce a large number of photons in the 140-250 keV range, which may be readily detected by conventional gamma cameras.

For in vivo diagnosis, radioisotopes may be bound to immunoglobulin either directly or indirectly by using an intermediate functional group. Intermediate functional groups which often are used to bind radioisotopes which exist as metallic ions to immunoglobulins are the bifunctional chelating agents such as diethylenetriaminepentacetic acid (DTPA) and ethylenediaminetetraacetic acid (EDTA) and similar molecules. Typical examples of metallic ions which can be bound to the monoclonal antibodies of the invention are ¹¹¹ In, ⁹⁷ Ru, ⁶⁷ Ga, ⁶⁸ Ga, ⁷² As, ⁸⁹ Zr, and ²⁰¹ TI.

A monoclonal antibody useful in the method of the invention can also be labeled with a paramagnetic isotope for purposes of in vivo diagnosis, as in magnetic resonance imaging (MRI) or electron spin resonance (ESR). In general, any conventional method for visualizing diagnostic imaging can be utilized. Usually gamma and positron emitting radioisotopes are used for camera imaging and paramagnetic isotopes for MRI. Elements which are particularly useful in such techniques include ¹⁵⁷ Gd, ⁵⁵ Mn, ¹⁶² Dy, ⁵² Cr, and ⁵⁶ Fe.

The present invention also provides a method for treating a subject with a cell proliferative disorder associated with JAK3 comprising administering to a subject with the disorder a therapeutically effective amount of reagent which modulates JAK3. In hematopoietic cancers, for example, the JAK3 nucleotide sequence may be under-expressed as compared to expression in a normal cell, therefore, it is possible to design appropriate therapeutic or diagnostic techniques directed to this sequence. Thus, where a cell-proliferative disorder is associated with the expression of JAK3 associated with malignancy, nucleic acid sequences that modulate JAK3 expression at the transcriptional or translational level can be used. In cases when a cell proliferative disorder or abnormal cell phenotype is associated with the under expression of JAK3, for example, nucleic acid sequences encoding JAK3 (sense) could be administered to the subject with the disorder.

The term "cell-proliferative disorder" denotes malignant as well as non-malignant cell populations which often appear to differ from the surrounding tissue both morphologically and genotypically. Such disorders may be associated, for example, with absence of expression of JAK3. Essentially, any disorder which is etiologically linked to expression of JAK3 could be considered susceptible to treatment with a reagent of the invention which modulates JAK3 expression.

The term "modulate" envisions the suppression of JAK3 gene expression when JAK3 is over-expressed. When JAK3 is over-expressed, an antisense polynucleotide for JAK3 can be introduced into the cell. Alternatively, when a cell proliferative disorder is associated with under-expression of JAK3 polypeptide, a sense polynucleotide sequence (the DNA coding strand) encoding JAK3 polypeptide can be introduced into the cell. The term "therapeutically effective" amount refers to that amount of reagent includes that amount which modulates JAK3 expression o kinase activity such that the symptoms of the disorder are reduced.

The present invention also provides gene therapy for the treatment of cell proliferative disorders which are mediated by JAK3. Such therapy would achieve its therapeutic effect by introduction of the appropriate JAK3 polynucleotide which contains a JAK3 gene (sense), into cells of subjects having the proliferative disorder. Delivery of sense JAK3 polynucleotide constructs can be achieved using a recombinant expression vector such as a chimeric virus or a colloidal dispersion system. An expression vector including the JAK3 polynucleotide sequence could be introduced to the subject's cells ex vivo after removing, for example, stem cells from a subject's bone marrow. The cells are then reintroduced into the subject, (e.g., into subject's bone marrow).

Various viral vectors which can be utilized for gene therapy as taught herein include adenovirus, herpes virus, vaccinia, or, preferably, an RNA virus such as a retrovirus. Preferably, the retroviral vector is a derivative of a murine or avian retrovirus. Examples of retroviral vectors in which a single foreign gene can be inserted include, but are not limited to: Moloney murine leukemia virus (MoMuLV), Harvey murine sarcoma virus (HaMuSV), murine mammmary tumor virus (MuMTV), and Rous Sarcoma Virus (RSV), and gibbon ape leukemia virus (GaLV), which provides a broader host range than many of the murine viruses. A number of additional retroviral vectors can incorporate multiple genes. All of these vectors can transfer or incorporate a gene for a selectable marker so that transduced cells can be identified and generated. By inserting a JAK3 sequence (including promoter region) of interest into the viral vector, along with another gene which encodes the ligand for a receptor on a specific target cell, for example, the vector is now target specific. Preferred targeting is accomplished by using an antibody to target the retroviral vector. Those of skill in the art will know of, or can readily ascertain without undue experimentation, specific polynucleotide sequences which can be inserted into the retroviral genome to allow target specific delivery of the retroviral vector containing the JAK3 sense or antisense polynucleotide.

Since recombinant retroviruses are defective, they require assistance in order to produce infectious vector particles. This assistance can be provided, for example, by using helper cell lines that contain plasmids encoding all of the structural genes of the retrovirus under the control of regulatory sequences within the LTR. These plasmids are missing a nucleotide sequence which enables the packaging mechanism to recognize an RNA transcript for encapsidation. Helper cell lines which have deletions of the packaging signal include but are not limited to ψ2, PA317 and PA12, for example. These cell lines produce empty virions, since no genome is packaged. If a retroviral vector is introduced into such cells in which the packaging signal is intact, but the structural genes are replaced by other genes of interest, the vector can be packaged and vector virion produced.

Another targeted delivery system for JAK3 polynucleotide is a colloidal dispersion system. Colloidal dispersion systems include macromolecule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes. The preferred colloidal system of this invention is a liposome. Liposomes are artificial membrane vesicles which are useful as delivery vehicles in vitro and in vivo. It has been shown that large unilamellar vesicles (LUV), which range in size from 0.2-4.0 um can encapsulate a substantial percentage of an aqueous buffer containing large macromolecules. RNA, DNA and intact virions can be encapsulated within the aqueous interior and be delivered to cells in a biologically active form (Fraley, et al., Trends Biochem. Sci., 6:77, 1981). In addition to mammalian cells, liposomes have been used for delivery of polynucleotides in plant, yeast and bacterial cells. In order for a liposome to be an efficient gene transfer vehicle, the following characteristics should be present: (1) encapsulation of the genes of interest at high efficiency while not compromising their biological activity; (2) preferential and substantial binding to a target cell in comparison to non-target cells; (3) delivery of the aqueous contents of the vesicle to the target cell cytoplasm at high efficiency; and (4) accurate and effective expression of genetic information (Mannino, et al., Biotechniques, 6:682, 1988).

The composition of the liposome is usually a combination of phospholipids, particularly high-phase-transition-temperature phospholipids, usually in combination with steroids, especially cholesterol. Other phospholipids or other lipids may also be used. The physical characteristics of liposomes depend on pH, ionic strength, and the presence of divalent cations.

Examples of lipids useful in liposome production include phosphatidyl compounds, such as phosphatidylglycerol, phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, sphingolipids, cerebrosides, and gangliosides. Particularly useful are diacylphosphatidylglycerols, where the lipid moiety contains from 14-18 carbon atoms, particularly from 16-18 carbon atoms, and is saturated. Illustrative phospholipids include egg phosphatidylcholine, dipalmitoylphosphatidylcholine and distearoylphosphatidylcholine.

The targeting of liposomes has been classified based on anatomical and mechanistic factors. Anatomical classification is based on the level of selectivity, for example, organ-specific, cell-specific, and organelle-specific. Mechanistic targeting can be distinguished based upon whether it is passive or active. Passive targeting utilizes the natural tendency of liposomes to distribute to cells of the reticulo-endothelial system (RES) in organs which contain sinusoidal capillaries. Active targeting, on the other hand, involves alteration of the liposome by coupling the liposome to a specific ligand such as a monoclonal antibody, sugar, glycolipid, or protein, or by changing the composition or size of the liposome in order to achieve targeting to organs and cell types other than the naturally occurring sites of localization.

The surface of the targeted delivery system may be modified in a variety of ways. In the case of a liposomal targeted delivery system, lipid groups can be incorporated into the lipid bilayer of the liposome in order to maintain the targeting ligand in stable association with the liposomal bilayer. Various linking groups can be used for joining the lipid chains to the targeting ligand.

In general, the compounds bound to the surface of the targeted delivery system will be ligands and receptors which will allow the targeted delivery system to find and "home in" on the desired cells. A ligand may be any compound of interest which will bind to another compound, such as a receptor.

In general, surface membrane proteins which bind to specific effector molecules are referred to as receptors. In the present invention, antibodies are preferred receptors. Antibodies can be used to target liposomes to specific cell-surface ligands. For example, certain antigens expressed specifically on tumor cells, referred to as tumor-associated antigens (TAAs), may be exploited for the purpose of targeting JAK3 antibody-containing liposomes directly to the malignant tumor. Since the JAK3 gene product may be indiscriminate with respect to cell type in its action, a targeted delivery system offers a significant improvement over randomly injecting non-specific liposomes. Preferably, the target tissue is human brain, colon, lung, and renal cancers. A number of procedures can be used to covalently attach either polyclonal or monoclonal antibodies to a liposome bilayer. Antibody-targeted liposomes can include monoclonal or polyclonal antibodies or fragments thereof such as Fab, or F(ab')₂, as long as they bind efficiently to an antigenic epitope on the target cells. Liposomes may also be targeted to cells expressing receptors for hormones or other serum factors.

For use in the diagnostic research and therapeutic applications suggested above, kits are also provided by the invention. The invention provides a diagnostic kit useful for the detection of a target cellular component indicative of a cell proliferative disorder associated with JAK3 comprising carrier means being compartmentalized to receive in close confinement therein one or more containers comprising a first container containing a probe for detection of JAK3 nucleic acid. Such a kit may comprise a carrier means being compartmentalized to receive in close confinement one or more container means such as vials, tubes, and the like, each of the container means comprising one of the separate elements to be used in the method.

For example, one of the container means may comprise a probe which is or can be detectably labelled. Such probe may be an antibody or nucleotide specific for a target protein or a target nucleic acid, respectively, wherein the target is indicative, or correlates with, the presence of JAK3 of the invention. Where the kit utilizes nucleic acid hybridization to detect the target nucleic acid, the kit may also have containers containing nucleotide(s) for amplification of the target nucleic acid sequence and/or a container comprising a reporter-means, such as a biotin-binding protein, such as avidin or streptavidin, bound to a reporter molecule, such as an enzymatic, florescent, or radionucleotide label.

The above disclosure generally describes the present invention. A more complete understanding can be obtained by reference to the following specific examples which are provided herein for purposes of illustration only and are not intended to limit the scope of the invention.

EXAMPLE 1 CLONING AND SEQUENCING OF JAK3

In order to clone the cDNA for a new member of the JAK family of non-receptor protein tyrosine kinases, degenerate oligonucleotides corresponding to parts of the highly conserved tyrosine kinase domain were used to amplify first strand cDNA from oligo (dT) primed, reverse transcribed, CD34+ total RNA from normal human bone marrow.

1. Bone Marrow Fractions

Iliac crest bone marrow was aspirated from consenting adult volunteers under an IRB approved protocol. Mononuclear cells were separated by Ficoll-Hypaque (Pharmacia, Piscataway, N.J.) density gradient separation. Cell subsets were purified by immunomagnetic separation (Strauss, L. C., et al., The American Journal of Pediatric Hematology/Oncology, 13:217, 1991, Civin, C. I., et al, Bone Marrow Purging and Processing, 1990). Positive selection of the CD34+ fraction was done by incubation of the mononuclear fraction with 0.5 ug CD34 (HPCA-1, Becton Dickinson, San Jose, Calif.) antibody per 10⁶ cells for 30 minutes at 4° C. Cells were washed twice in RPMI 1640 (Sigma, St. Louis, Mo.) then resuspended in RPMI-1640 containing 1% human serum albumin at 5×10⁷ cells/ml and incubated with sheep anti-mouse IgG1 conjugated immunomagnetic microspheres for 30 minutes at 4° C. The CD34+ bound cells were released from the microspheres by treatment with chymopapain (Chymodiactin TM, Boots USA, Lincolnshire Ill.; final concentration 200 U/ml, 15 min., RT). The microspheres were removed from the free (CD34+ enriched) cells using a magnetic particle concentrator (Dynal, Great Neck, N.Y.). CD34+ cells were further purified to obtain CD34+/Lin- cells by negative selection as described by Gore (Gore, S. D. et al., Blood, 8:1681, 1991).

2. Isolation of RNA

Poly A+ RNA was isolated from human hematopoietic cell lines using the Mini Ribosep mRNA isolation kit (Becton Dickinson, San Jose, Calif.). Total RNA from bone marrow cells and hematopoietic cell lines was extracted using the guanidium thiocyanate method (Chomczynski, P. and Sacchi, N., Anal Biochem., 162:156, 1987).

3. Cloning of JAK3

Total RNA isolated from CD34+ cells (see above) was reverse transcribed with Superscript Moloney murine-leukemia-virus reverse transcriptase (BRL, Gaithersburg, Md.) using oligo d(T) (Boehringer Mannheim, Germany) for priming. PCR amplification was carried out using degenerate oligonucleotides based on the highly conserved sequence motifs VHRDLA (5' GTNCA(T,C)(T,C)(C,A) GNGA(T,C)(TN GC3') AND DVWSYG (5' CCC(G,A)TAN(G,C)(A,T) CCA NAC (G,A)TC3') from the PTK catalytic domain (Wilks, A. F., et al., Gene, 85:67, 1989, Wilks, A. F., Methods in Enzymology, 200:533, 1991). To facilitate subcloning of the amplified PCR products Not 1 and Sal 1 sites were included as part of the PCR primers.

The resultant 226 bp bands were isolated after electrophoresis in agarose gels and cloned into the Not 1/Sal 1 sites of pBluescript II KS- (Stratagene, La Jolla, Calif.). After sequencing, products containing known tyrosine kinase motifs were compared to reported sequences using the NCBI BlastN program (Altschul, S. F., et al., Journal of Molecular Biology, 215:403, 1990). The fragment did not match any other sequences in the databases but was most closely related to members of the JAK family of tyrosine kinases at 65-70% nucleic acid identity.

The conditions for RT-PCR and thermal RACE were carried out as described by Frohman (Frohman, M. A., Methods in Enzymology, 218:340, 1993). KG1a poly A+ RNA was used as the substrate for RACE. The 5' and 3' ends of JAK3 were also amplified from normal human bone marrow cDNA isolated from a λgt10 human bone marrow library (Clonetech, Palo Alto, Calif.) using primers specific for JAK3 with primers specific for the arms of λgt10 under the same PCR conditions used for RACE.

4. Sequencing of JAK3

To correct for PCR errors, multiple overlapping partial clones of JAK3 isolated from KG 1a and bone marrow cells were sequenced and compared using the dideoxy DNA sequencing method (USB, Cleveland, Ohio) (Sanger, F., et al., Proc. Natl. Acad. Sci. USA, 74:5463, 1977). To verify some regions, RT PCR amplified fragments from normal human bone marrow and exon containing portions of normal human JAK3P 1 genomic clones (see below) were also sequenced.

5. RNAse Protection Assays

Efforts to obtain the full-length JAK3 clone by screening of several libraries proved unsuccessful. Therefore, RNAse protection assay were developed utilizing the initial PCR amplified kinase domain fragment to screen for leukemic derived cell lines expressing JAK3. RNAse protection assays were carried out using the MAXIscript T3 in vitro Transcription Kit (Ambion, Austin, Tex.). Briefly, an anti-sense RNA probe was synthesized by runoff transcription using Bacteriophage T3 RNA polymerase on a pBluescript II KS- (Stratagene, La Jolla, Calif.) template linearized downstream of the JAK3 207 nucleotide PTK domain fragment. The resulting ³² Pα-UTP labelled 249 base RNA probe was hybridized with approximately 5 μg of total RNA from hematopoietic cell lines and RNA from approximately equal numbers of cells from normal human bone marrow sub-fractions. RNA-RNA hybrids were treated with RNAse A and T, denatured and separated on an 8M-Urea, 6% acrylamide gel and exposed to film (Kodak X-OMAT) (Melton, D. A., et al., Nucleic Acids Research, 12:7035, 1984). As an internal standard, a β-actin probe was also included with each hybridization reaction.

6. JAK3 nucleotide and predicted amino acid sequence

Of the cell lines tested in this initial screening, JAK3 was most highly expressed by the myeloblastic cell line KG1a. Thermal RACE and PCR was employed to cone the full-length cDNA of JAK3 from KG1a and normal human bone marrow cells (Frohman, M. A., Therman RACE, Methods in Enzymology, 218:340, 1993). Using several rounds of RACE we isolated 3,807 bp of JAK3 cDNA, a region which covers the entire predicted coding region for JAK3, 167 bases of 5' untranslated and 394 bases of 3' untranslated sequence. FIG. 1 shows the nucleotide and predicted amino acid sequence of JAK3. The cDNA includes an open reading frame of 3,246 bases that predicts a protein of 1082 amino acids with a molecular weight of 121 kD. The putative initiating methionine shows the strongest homology with the Kozak consensus sequence (Kozak, M., Nucleic Acids Research, 15:8125, 1987). At the 3' end an in frame stop codon defines the C terminus of the JAK3 protein at position 3242.

EXAMPLE 2 SEQUENCE COMPARISON BETWEEN JAK3 AND OTHER JAK FAMILY MEMBER

1. Amino acid comparison between JAK3 and other JAK family members

The initial identification of JAK3 as the fourth member of the JAK family was based on a database search using the 207 bp PCR fragment. The comparison of full-length-JAK3 with the other JAK family members is shown in FIG. 2. Sequences of JAK family members were aligned using the Pileup program (GCG Company, Madison, Wis.). The numbering system begins with the initiating methionine of the JAK family members. The numbering system does not take into account the insertion of gaps and, therefore, should be only regarded as a relative measure of location. The fifth line in the figure shows a consensus sequence derived if three out of four JAK family members have the identical amino acid in that position. Full-length JAK3 has 48% identity and 67% similarity with JAK2 (murine), 41% identity and 61% similarity with JAK1, and 40% identity and 60% similarity with TYK-2. In addition, recently, small fragments of tyrosine kinases by PCR approaches from a human breast cancer cell line (TK5) and rat brain (Ptk-2) have been isolated (Cance, W. G., et al., Int. J. Cancer, 54:571, 1993, Sanchez, M. P., et al., Proc. Natl. Acad. Sci. USA, 91:1819, 1994). Both of these TK's show 93% identity with JAK3 in this short region, while rat Jak3 shares 99% identity in this region. How JAK3 relates to these PTKs must await the isolation of their full coding regions.

2. Amino acid comparison between JAK3 and rat JAK3

FIG. 3 shows the comparison of JAK3 with the recently reported rat Jak3. The sequences of human JAK3 and rat Jak3 were aligned using the Pileup program (GCG Company, Madison, Wis.) The amino acids of each member are numbered beginning with the initiating methionine. The comparison shows 77% identity and 84% similarity making it likely that these genes are homologies (Takahashi, T. and Shirasawa, T., FEBS Letters, 342:124, 1994).

EXAMPLE 3 CHARACTERIZATION OF JAK3 EXPRESSION

1. RNAse protection analysis of JAK3 expression in leukemic derived cell lines

To investigate the hematopoietic expression of JAK3, the RNAse protection assay was used utilizing the 206 bp PCR kinase domain fragment of JAK3 to screen leukemic derived cell lines (see above). Briefly, a 32P α-UTP labelled anti-sense RNA probe to the kinase domain of JAK3 was hybridized with 5 ugs total RNA from hematopoietic cell lines. A β-actin probe was also included with each reaction as an internal standard, with the exception of the bone marrow and ML-1 populations, which were separately assayed for JAK3 and actin. As shown in FIG. 4a, a protected band migrating at the expected size is seen in a number of lanes. Positive signals were discernable for the Molt-16, Molt-3, KG1, KG1a, PB697, Nalm-16, Nalm-6, and TF-1 cell lines. These positive cell lines represent various forms of leukemia; the Molt lines were derived from T-lineage ALL, the KG1 lines from AML, PB697 and the Nalm lines are B lineage ALL, and TF-1 was established from an erythroleukemia. No signals were seen from RNA derived from the ML-1, HL60, K562, or Daudi cell lines representing additional AML, APL, CML, and Burkitt's leukemia lines, respectively.

2. Northern blot analysis of JAK3 expression in leukemic derived cell lines

Although the coding region of the cDNAs for the JAK family are ˜3400 bp, the 5' and 3' untranslated regions and polyadenylation result in transcripts ranging from 4.4 kbp for JAK1, 4.8 kbp for JAK2, 5.4 kbp for TYK-2 and 4.0 kbp for rat Jak3. To investigate the size of JAK3 message, a Northern blot with poly A+ RNA isolated from a number of hematopoietic cell lines was probed with a 1.8 kbp JAK3 fragment. 5 μg of poly A+ RNA samples from hematopoietic cell lines were incubated at 55° C. for 15 minutes with 50% formamide, 6.5% formaldehyde, and 1×MOPS. Following the addition of formaldehyde loading buffer and ethidium bromide, RNA samples were electrophoresed in a 1.2% agarose gel containing 1×MOPS and 11% formaldehyde. Following electrophoresis, gels were transferred by capillary action to nitrocellulose 47. Sambrook J., Fritsch E. F., Maniatis T.: Molecular Cloning. A Laboratory Manual. 1989). As is evident from FIG. 4b (upper half), JAK3 is not a very highly expressed message. Even after an exposure of 17 days at -80° C. with two intensifying screens, signals were barely visible in the lanes containing RNA from the HEL, REH, KG1, and KG1 a cell lines (HEL represents an erythroleukemia, REH is derived from a B-lineage ALL, and the KG1 and KG1a cell lines are myeloblastic). RNA markers give an estimate of 5.8 kbp for the JAK3 transcript in these cells.

3. Northern blot analysis of JAK3 expression in non-hematopoietic tissues

To assess the expression of JAK3 in non-hematopoietic normal adult tissues, a Northern blot containing 2 μg of poly A+ RNA from human heart, brain, placenta, lung, liver, skeletal muscle, kidney, and pancreas was screened. (Clonetech, Palo Alto, Calif.). Northern blots were prehybridized for 2 hrs in 50% formamide, 5× SSPE, 10× Denhardt's, 2% SDS, and 100 ug/ml denatured salmon sperm DNA (Clonetech). Blots were hybridized with a randomly primed ³² P-dCTP labeled probe corresponding to a 1.8 kbp fragment of JAK3 cDNA (Feinberg, A. P. and Vogelstein, B., Anal. Biochem., 132:6, 1983). The blots were exposed to film (Kodak x-OMAT) for 1'/days at -80° C. between two intensifying screens.

When the same JAK3 fragment was also used to probe a Northern blot containing RNA from non-hematopoietic human tissues (FIG. 4c), signals are seen from placenta, lung, liver, kidney, and pancreas, all with a similar message size of 5.8 kbp with possibly an additional less distinct band at -7.5 kbp. Unlike rat JAK3, which is expressed in rat heart and brain, no signals were seen from the RNA representing heart, brain, or skeletal muscle.

4. RNAse Protection of JAK3 expression in normal bone marrow fractions

Although the initial JAK3 fragment was generated by PCR amplification of CD34+ enriched bone marrow RNA, it remained a possibility that JAK3 expression was restricted to contaminating CD34- cells. To determine which populations of normal bone marrow express JAK3, fractions representing whole BM, CD34+, CD34- (i.e. depleted of CD34+ cells), CD34+/lin-, as well as peripheral blood were isolated. RNA was then extracted and used to perform the RNAse protection assay. The same probe used in FIG. 4a was hybridized with approximately 1-5 μgs of RNA from normal total bone marrow, bone marrow subfractions, and from peripheral blood. As an internal standard, a β-actin probe was also included with each reaction as a standard for the amount and quality of RNA loaded in each sample. The presence of a band that migrates between the JAK3 and actin bands in all lanes, including the no RNA and tRNA control lanes, is a result of incomplete digestion of the probe. All of the sample lanes give a protected JAK3 band migrating at the expected size. However, probably because of the limited amounts of RNA obtained from several fractions, the actin bands indicate a variation in total RNA loaded for each sample.

To determine the relative expression of JAK3 in these different populations, the bands were quantified by phosphorimager scanning and normalized relative to the actin signal. FIG. 5b shows the phosphorimage analysis of bone marrow fractions. Following exposure to film, the gel shown in FIG. 5b was exposed to a phosphor-image screen (Molecular Dynamics, Sunnyvale, Calif.). Bands were quantified using the ImageQuantify program and normalized relative to the actin signals. FIG. 5b shows the strongest relative signals result from the CD34+ RNA and the even more stem cell enriched CD34+/lin- RNA sample. Thus, JAK3 is most highly expressed in this primitive population of cells and may play a role in transducing the signal of receptor functioning in the proliferative, survival and/or developmental pathways of these cells. JAK3 is also expressed in the CD34- and peripheral blood fractions and is thus likely to be involved with a subset of receptors involved in differentiated cell signalling, in analogy to JAK1, JAK2, and TYK-2.

EXAMPLE 4 CHROMOSOMAL LOCALIZATION OF THE JAK3 GENE

1. Somatic cell hybrid analysis

To determine the chromosomal localization of the JAK3 gene, a human/rodent somatic cell hybrid mapping panel, NIGMS #2, which included human, mouse and hamster genomic DNA controls was screened by PCR (Drwinga, H., et al., Genomics, 16:311, 1993, Dubois, B. and Naylor, S., Genomics, 16:315, 1993). In this panel, most of the somatic cell hybrid samples contained DNA from a single specific human chromosome in a rodent background. To preclude cDNA contamination problems, a primer pair was selected that resulted in a PCR product from genomic DNA that was larger than the produce resulting from cDNA due to the presence of intronic sequence. The plus strand oligo 5'AGCCGCCTCCTTCTCT3' (SEQ. ID NO:3) and minus strand oligo 5'CGGCAGCAGCTTAGCTAGG3' (SEQ. ID NO:4) amplify an approximate 410 base pair product from human genomic DNA and a 156 base pair product from JAK3 cDNA.

For PCR, 100 ngs of genomic DNA from each hybrid cell line were used as the target for amplification. PCR amplification was performed using the following parameters: (94° C., 1'->55° C., 1'->72° C., 2')×30->72° C., 15'. The final concentrations of reagents were 0.2 mM dNTP, 50 mM KCL, 3.0 mM Mg, 0.1 U Taq Polymerase/ml, and 2.5 mM each primer. The results from the PCR amplification were confirmed by Southern transfer and hybridization with a ³² P γ-ATP kinase labelled oligo internal to the primers used for amplification.

Using the primer pair results in a PCR product only with DNA from human cells and not from mouse or hamster DNA. These oligonucleotides were then used on DNA samples from the library representing each of the human chromosomes. The amplified DNA was electrophoresed and after transfer to nitrocellulose was hybridized to a radiolabelled oligonucleotide internal to the other oligonucleotides used for the PCR. Only the DNA from a cell line containing human chromosome 19 gave a significant signal.

2. Fluorescence in situ hybridization

TYK-2 has also been mapped to chromosome 19 (JAK1 and JAK2 have been mapped to 1p31.3 and 9p24, respectively)⁵⁵,56 Several pairs of tyrosine kinases (eg. PDGFRβ and c-fms, PDGFα and c-kit, FLT3 and FLT1) have been shown to be closely linked, leading to the hypothesis that these receptor tyrosine kinases evolved by a trans duplication followed by a cis duplication.⁵⁷⁻⁶⁰ In order to confirm the location of the gene on chromosome 19, to sublocalize the gene to a specific band, and to investigate the possibility that JAK3 and TYK-2 were linked, FISH experiment was carried out.

First clone containing approximately 80 kbp of the JAK3 gene was isolated by PCR screening of a P1 library using the same oligonucleotides used above. Briefly, P1 genomic clones of JAK3 were obtained by PCR screening of the Du Pont Merck Pharmaceutical Company Human Foreskin Fibroblast P1 Library #1 (DMPC-HFF#1)-(Genome System, St. Louis, Mo.). The clones were designated DMPC-HFF#1-1441, DMPC-HFF#1-1442, DMPC-HFF#1-1443 and identified using the same primer pairs and PCR conditions used for the screening of the human/rodent somatic cell hybrid mapping panel (see above). Partial sequencing of these P1 clones has confirmed that they represent genomic JAK3 DNA.

The P1 vector containing the approximate 80 kbp genomic clone 1441 of JAK3 was nick-translated with biotin-14 dATP (BRL, Gaithersburg, Md.), with 30% incorporation determined by tritium tracer incorporation. Slides with chromosome spreads were made from normal male lymphocytes cultured with BrdU (Bhatt, B., et al., Nucleic Acids Res., 16:3951, 1988). Fluorescence in situ hybridization was performed as described by Lichter, et. al., (53. Lichter, P., Tang, C., Call, K., Hermanson, G., Evans, G., Housman, D., Ward, D.: High resolution mapping of human chromosome 11 by in situ hybridization with cosmid clones. Science 247:64, 1990) with modifications. Probe mix (2× SSCP, 60% formamide, 10% dextran sulfate, 4 ng/ul biotinylated probe, 300 ng/ul Cot-1 DNA (to suppress repeated sequences) and 150 ng/ul salmon sperm DNA was denatured at 70° C. for 5 minutes, preannealed at 37° C. for 40 minutes, placed on slides and hybridized at 37° C. overnight. Slides were washed in 70% formamide/2× SSC at 43° C. for 20 minutes, and 2 changes of 2× SSC at 37° C. for 5 minutes each. Biotinylated probe was detected with FITC-avidin and amplified with biotinylated anti-avidin, using reagents from an in situ hybridization kit (Oncor Inc., Gaithersburg, Md.), following the manufacturer's instructions.

Analysis of 36 metaphase cells showed 20 cells (56%) had at least one pair of signals (involving both chromatids of a single chromosome). These 20 metaphases were photographed on color slide film (Kodak Ekttachrome 400HC) and 33 paired signals were seen, with all but one located on the proximal short arm of an F-group (chr. 19 or 20) chromosome, an example of which is shown in FIG. 6a. To determine the specific chromosome and band location of the signals, the hybridized slides were G-banded by FPG (fluorescence plus Giemsa), photographed, and aligned with the color slides to determine the subband location. FIG. 6b shows the position of the paired FISH signals on the G-banded chromosomes. All 33 signals were analyzable after banding and all were on chromosome 19, with most on bands p12-13.1 (FIG. 6c). Thus JAK3 may be located near TYK-2, which has been localized to 19p13.2. FIG. 6c is the ideogram of human chromosome 19, showing localization of JAK3 to 19p12-13.1. Each dot represents a paired signal seen on metaphase chromosomes. Signals clearly located on a single band are diagrammed to the right of the ideogram; those which could not be sublocalized to a single band are assigned to regions diagrammed to the left (brackets).

The foregoing is meant to illustrate, but not to limit, the scope of the invention. Indeed, those of ordinary skill in the art can readily envision and produce further embodiments, based on the teachings herein, without undue experimentation.

    __________________________________________________________________________     SEQUENCE LISTING                                                               (1) GENERAL INFORMATION:                                                       (iii) NUMBER OF SEQUENCES: 12                                                  (2) INFORMATION FOR SEQ ID NO:1:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 3807 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: DNA                                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:1:                                        AAACAGTTAATACATATTTTTTATGTTACGTGTATTCTGTACAACAAAGTAAGCTAGACA60                 AAAGAAAATGTTTTCTCCTTCCTGTGTGGGACTTTCCTCTCGCTGCCTCCCGGCTCTGCC120                CGCCCTTCGAAAGTCCAGGGTCCCTGCCCGCTAGGCAAGTTGCACTCATGGCACCT176                    MetAlaPro                                                                      CCAAGTGAAGAGACGCCCCTGATCCCTCAGCGTTCATGCAGCCTCTTG224                            ProSerGluGluThrProLeuIleProGlnArgSerCysSerLeuLeu                               51015                                                                          TCCACGGAGGCTGGTGCCCTGCATGTGCTGCTGCCCGCTCGGGGCCCC272                            SerThrGluAlaGlyAlaLeuHisValLeuLeuProAlaArgGlyPro                               20253035                                                                       GGGCCCCCCCAGCGCCTATCTTTCTCCTTTGGGGACCACTTGGCTGAG320                            GlyProProGlnArgLeuSerPheSerPheGlyAspHisLeuAlaGlu                               404550                                                                         GACCTGTGCGTGCAGGCTGCCAAGGCCAGCGCGATCCTGCCTGTGTAC368                            AspLeuCysValGlnAlaAlaLysAlaSerAlaIleLeuProValTyr                               556065                                                                         CACTCCCTCTTTGCTCTGGCCACGGAGGACCTGTCCTGCTGGTTCCCC416                            HisSerLeuPheAlaLeuAlaThrGluAspLeuSerCysTrpPhePro                               707580                                                                         CGAGCCACATCTTCTCCGTGGAGGATGCCAGCACCCCAAGTCCTGCTG464                            ArgAlaThrSerSerProTrpArgMetProAlaProGlnValLeuLeu                               859095                                                                         TACAGGATTCGCTTTTACTTCCCCAATTGGTTTGGGCTGGAGAAGTGC512                            TyrArgIleArgPheTyrPheProAsnTrpPheGlyLeuGluLysCys                               100105110115                                                                   CACCGCTTCGGGCTACGCAAGGATTTGGCCAGTGCTATCCTTGACCTG560                            HisArgPheGlyLeuArgLysAspLeuAlaSerAlaIleLeuAspLeu                               120125130                                                                      CCAGTCCTGGAGCACCTCTTTGCCCAGCACCGCAGTGACCTGGTGAGT608                            ProValLeuGluHisLeuPheAlaGlnHisArgSerAspLeuValSer                               135140145                                                                      GGGCGCCTCCCCCGTGGCCTCAGTCTCAAGGAGCAGGGTGAGTGTCTC656                            GlyArgLeuProArgGlyLeuSerLeuLysGluGlnGlyGluCysLeu                               150155160                                                                      AGCCTGGCCGTGTTGGACCTGGCCCGGATGGCGCGAGAGCAGGCCCAG704                            SerLeuAlaValLeuAspLeuAlaArgMetAlaArgGluGlnAlaGln                               165170175                                                                      CGGCGGGGAGAGCTGCTGAAGACTGTCAGCTACAAGGCCTGCCTACCC752                            ArgArgGlyGluLeuLeuLysThrValSerTyrLysAlaCysLeuPro                               180185190195                                                                   CCAAGCCTGCGCGACCTGATCCAGGGCCTGAGCTTCGTGACGGGGAGG800                            ProSerLeuArgAspLeuIleGlnGlyLeuSerPheValThrGlyArg                               200205210                                                                      CGTATTCGGAGGACGGTGGAGAGCCCCCTGCGCCGGGTGGCCGCCTGC848                            ArgIleArgArgThrValGluSerProLeuArgArgValAlaAlaCys                               215220225                                                                      CAGGCAGACCGGCACTCGCTCATGGCCAAGTACATCATGGACCTGGAG896                            GlnAlaAspArgHisSerLeuMetAlaLysTyrIleMetAspLeuGlu                               230235240                                                                      CGGCTGGATCCAGCCGGGGCCGCCGAGACCTTCCACGTGGGCCTCCCT944                            ArgLeuAspProAlaGlyAlaAlaGluThrPheHisValGlyLeuPro                               245250255                                                                      GGGGCCCTTGGTGGCCACGACGGGCTGGGGCTCGTCCGCGTGGCTGGT992                            GlyAlaLeuGlyGlyHisAspGlyLeuGlyLeuValArgValAlaGly                               260265270275                                                                   GACGGCGGCATCGCCTGGACCCAGGGAGAACAGGAGGTCCTCCAGCCC1040                           AspGlyGlyIleAlaTrpThrGlnGlyGluGlnGluValLeuGlnPro                               280285290                                                                      TTCTGCGACTTTCCAGAAATCGTAGACATTAGCATCAAGCAGGCCCCG1088                           PheCysAspPheProGluIleValAspIleSerIleLysGlnAlaPro                               295300305                                                                      CGCGTTGGCCCGGCCGGAGAGCACCGCCTGGTCACTGTTACCAGGACA1136                           ArgValGlyProAlaGlyGluHisArgLeuValThrValThrArgThr                               310315320                                                                      GACAACCAGATTTTAGAGGCCGAGTTCCCAGGGCTGCCCGAGGCTCTG1184                           AspAsnGlnIleLeuGluAlaGluPheProGlyLeuProGluAlaLeu                               325330335                                                                      TCGTTCGTGGCGCTCGTGGACGGCTACTTCCGGCTGACCACGGACTCC1232                           SerPheValAlaLeuValAspGlyTyrPheArgLeuThrThrAspSer                               340345350355                                                                   CAGCACTTCTTCTGCAAGGAGGTGGACCCGAGGCTGCTGGAGGAAGTG1280                           GlnHisPhePheCysLysGluValAspProArgLeuLeuGluGluVal                               360365370                                                                      GCCGAGCAGTGCCACGGCCCCATCACTCTGGACTTTGCCATCAACAAG1328                           AlaGluGlnCysHisGlyProIleThrLeuAspPheAlaIleAsnLys                               375380385                                                                      CTCAAGACTGGGGGCTCACGTCCTGGCTCCTATGTTCTCCGCCGCATC1376                           LeuLysThrGlyGlySerArgProGlySerTyrValLeuArgArgIle                               390395400                                                                      CCCCAGGACTTTGACAGCTTCCTCCTCACTGTCTGTGTCCAGAACCCC1424                           ProGlnAspPheAspSerPheLeuLeuThrValCysValGlnAsnPro                               405410415                                                                      CTTGGTCCTGATTATAAGGGCTGCCTCATCCGGCGCAGCCCCACAGGA1472                           LeuGlyProAspTyrLysGlyCysLeuIleArgArgSerProThrGly                               420425430435                                                                   ACCTTCCTTCTGGTTGGCCTCAGCCGACCCCACAGCAGTCTTCGAGAG1520                           ThrPheLeuLeuValGlyLeuSerArgProHisSerSerLeuArgGlu                               440445450                                                                      CTCCTGGCAACCTGCTGGGATGGGGGGCTGCACGTAGATGGGGTGGCA1568                           LeuLeuAlaThrCysTrpAspGlyGlyLeuHisValAspGlyValAla                               455460465                                                                      GTGACCCTCACTTCCTGCTGTATCCCCAGACCCAAAGAAAAGTCCAAC1616                           ValThrLeuThrSerCysCysIleProArgProLysGluLysSerAsn                               470475480                                                                      CTGATTGTGGTCCAGAGAGGTCACAGCCCACCCACATCATCCTTGGTT1664                           LeuIleValValGlnArgGlyHisSerProProThrSerSerLeuVal                               485490495                                                                      CAGCCCCAATCCCAATACCAGCTGAGTCAGATGACATTTCACAAGATC1712                           GlnProGlnSerGlnTyrGlnLeuSerGlnMetThrPheHisLysIle                               500505510515                                                                   CCTGCTGACAGCCTGGAGTGGCATGAGAACCTGGGCCATGGGTCCTTC1760                           ProAlaAspSerLeuGluTrpHisGluAsnLeuGlyHisGlySerPhe                               520525530                                                                      ACCAAGATTTACCGGGGCTGTCGCCATGAGGTGGTGGATGGGGAGGCC1808                           ThrLysIleTyrArgGlyCysArgHisGluValValAspGlyGluAla                               535540545                                                                      CGAAAGACAGAGGTGCTGCTGAAGGTCATGGATGCCAAGCACAAGAAC1856                           ArgLysThrGluValLeuLeuLysValMetAspAlaLysHisLysAsn                               550555560                                                                      TGCATGGAGTCATTCCTGGAAGCAGCGAGCTTGATGAGCCAAGTGTCG1904                           CysMetGluSerPheLeuGluAlaAlaSerLeuMetSerGlnValSer                               565570575                                                                      TACCGGCATCTCGTGCTGCTCCACGGCGTGTGCATGGCTGGAGACAGC1952                           TyrArgHisLeuValLeuLeuHisGlyValCysMetAlaGlyAspSer                               580585590595                                                                   ACCATGGTCGAGGAATTTGTACACCTGGGGGCCATAGACATGTATCTG2000                           ThrMetValGluGluPheValHisLeuGlyAlaIleAspMetTyrLeu                               600605610                                                                      CGAAAACGTGGCCACCTGGTGCCAGCCAGCTGGAAGCTGCAGGTGGTC2048                           ArgLysArgGlyHisLeuValProAlaSerTrpLysLeuGlnValVal                               615620625                                                                      AAACAGCTGGCCTACGCCCTCAACTATCTGGAGGACAAAGGCCTGTCC2096                           LysGlnLeuAlaTyrAlaLeuAsnTyrLeuGluAspLysGlyLeuSer                               630635640                                                                      CATGGCAATGTCTCTGCCCGGAAGGTGCTCCTGGCTCGGGAGGGGGCT2144                           HisGlyAsnValSerAlaArgLysValLeuLeuAlaArgGluGlyAla                               645650655                                                                      GATGGGAGCCCGCCCTTCATCAAGCTGAGTGACCCTGGGGTCAGCCCC2192                           AspGlySerProProPheIleLysLeuSerAspProGlyValSerPro                               660665670675                                                                   GCTGTGTTAAGCCTGGAGATGCTCACCGACAGGATCCCCTGGGTGGCC2240                           AlaValLeuSerLeuGluMetLeuThrAspArgIleProTrpValAla                               680685690                                                                      CCCGAGTGTCTCCGGGAGGCGCAGACACTTAGCTTGGAAGCTGACAAG2288                           ProGluCysLeuArgGluAlaGlnThrLeuSerLeuGluAlaAspLys                               695700705                                                                      TGGGGCTTCGGCGCCACGGTCTGGGAAGTGTTTAGTGGCGTCACCATG2336                           TrpGlyPheGlyAlaThrValTrpGluValPheSerGlyValThrMet                               710715720                                                                      CCCATCAGTGCCCTAGATCCTGCTAAGAAACTCCAATTTTATGAGGAC2384                           ProIleSerAlaLeuAspProAlaLysLysLeuGlnPheTyrGluAsp                               725730735                                                                      CGGCAGCAGCTGTCGGCCCCCAAGTGGACAGAGCTGGCCCTGCTGATT2432                           ArgGlnGlnLeuSerAlaProLysTrpThrGluLeuAlaLeuLeuIle                               740745750755                                                                   CAACAGTGCATGGCCTATGAGCCGGTCCAGAGGCCCTCCTTACGAGCC2480                           GlnGlnCysMetAlaTyrGluProValGlnArgProSerLeuArgAla                               760765770                                                                      GTCATTCGTGACCTCAATAGTCTCATCTCTTCAGACTATGAGCTCCTC2528                           ValIleArgAspLeuAsnSerLeuIleSerSerAspTyrGluLeuLeu                               775780785                                                                      TCAGACCACACCTGGTGCCCTGGCACTCGTGATGGGCTGTGGAATGGT2576                           SerAspHisThrTrpCysProGlyThrArgAspGlyLeuTrpAsnGly                               790795800                                                                      GCCCAGCTCTATGCCTGCCAAGACCCCACGATCTTCGAGGAGAGACAC2624                           AlaGlnLeuTyrAlaCysGlnAspProThrIlePheGluGluArgHis                               805810815                                                                      CTCAAGTACATCTCACAGCTGGGCAAGGGCTTCTTTGGCAGCGTGGAG2672                           LeuLysTyrIleSerGlnLeuGlyLysGlyPhePheGlySerValGlu                               820825830835                                                                   CTGTGCCGCTATGACCCGCTAGGCGACAATACAGGTGCCCTGGTGGCC2720                           LeuCysArgTyrAspProLeuGlyAspAsnThrGlyAlaLeuValAla                               840845850                                                                      GTGAAACAGCTGCAGCACAGCGGGCCAGACCAGCAGAGGGACTTTCAG2768                           ValLysGlnLeuGlnHisSerGlyProAspGlnGlnArgAspPheGln                               855860865                                                                      CGGGAGATTCAGATCCTCAAAGCACAGCACAGTGATTTCATTGTCAAG2816                           ArgGluIleGlnIleLeuLysAlaGlnHisSerAspPheIleValLys                               870875880                                                                      TATCGTGGTGTCAGCTATGGCCCGGGCCGCCAGAGCCCTGCGCTGGTC2864                           TyrArgGlyValSerTyrGlyProGlyArgGlnSerProAlaLeuVal                               885890895                                                                      ATGGAGTACCTGCCCAGCGGCTGCTTGCGCGACTTCCTGCAGCGGCAC2912                           MetGluTyrLeuProSerGlyCysLeuArgAspPheLeuGlnArgHis                               900905910915                                                                   CGGGGCCTCGATGCCAGCCGCCTCCTTCTCTATTCCTCGCAGATCTGC2960                           ArgGlyLeuAspAlaSerArgLeuLeuLeuTyrSerSerGlnIleCys                               920925930                                                                      AAGGGCATGGAGTACCTGGGCTCCCGCCGCTGCGTGCACCGCGACCTG3008                           LysGlyMetGluTyrLeuGlySerArgArgCysValHisArgAspLeu                               935940945                                                                      GCCGCCCGAAACATCCTCGTGGAGAGCGAGGCACACGTCAAGATCGCT3056                           AlaAlaArgAsnIleLeuValGluSerGluAlaHisValLysIleAla                               950955960                                                                      GACTTCGGCCTAGCTAAGCTGCTGCCGCTTGACAAAGACTACTACGTG3104                           AspPheGlyLeuAlaLysLeuLeuProLeuAspLysAspTyrTyrVal                               965970975                                                                      GTCCGCGAGCCAGGCCAGAGCCCCATTTTCTGGTATGCCCCCGAATCC3152                           ValArgGluProGlyGlnSerProIlePheTrpTyrAlaProGluSer                               980985990995                                                                   CTCTCGGACAACATCTTCTCTCGCCAGTCAGACGTCTGGAGCTTCGGG3200                           LeuSerAspAsnIlePheSerArgGlnSerAspValTrpSerPheGly                               100010051010                                                                   GTCGTCCTGTACGAGCTCTTCACCTACTGCGACAAAAGCTGCAGCCCC3248                           ValValLeuTyrGluLeuPheThrTyrCysAspLysSerCysSerPro                               101510201025                                                                   TCGGCCGAGTTCCTGCGGATGATGGGATGTGAGCGGGATGTCCCCCGC3296                           SerAlaGluPheLeuArgMetMetGlyCysGluArgAspValProArg                               103010351040                                                                   CTCTGCCGCCTCTTGGAACTGCTGGAGGAGGGCCAGAGGCTGCCGGCG3344                           LeuCysArgLeuLeuGluLeuLeuGluGluGlyGlnArgLeuProAla                               104510501055                                                                   CCTCCTTGCTGCCCTGCTGAGGTGAGTTGCTACAGTGGCTGGAGAGA3391                            ProProCysCysPro                                                                1060                                                                           CGACATCTGCCTGCCTGCTGAGTGAGTTGCTACAGTGGCTGAGAGACGACATCTGCTCCA3451               TGGCTGGTGGCCGACAGTAATCTCACGCCGGACCTGCCGCAGCCCCTGCCCCAGACCTCT3511               CACCATCACCGCCACCACCGTGCAGCTGCCACCAACCCTGCACGCTACTGCTGCCTCAGT3571               GGCTGTACCCAACAAGACCTGCTGACCCTCTGTCCCTACTGATTCCTCCTTGGGTGCAGC3631               CTCAGAGTGCCTGAGGCCCAGAGGGTCTGGTCTGGTGAGCTCCTGAGGCCACACAGCACC3691               ATAAAGTCTCGCATCTACAGGCCTTTGATTACCTCCTGGGATGGGTGCTCACTATCTACC3751               CCAGACCAACGCCACCTGCAGCCTGTGGAGTCAACTGCAGAATAAATCACACCCTA3807                   (2) INFORMATION FOR SEQ ID NO:2:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1064 amino acids                                                   (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2:                                        MetAlaProProSerGluGluThrProLeuIleProGlnArgSerCys                               151015                                                                         SerLeuLeuSerThrGluAlaGlyAlaLeuHisValLeuLeuProAla                               202530                                                                         ArgGlyProGlyProProGlnArgLeuSerPheSerPheGlyAspHis                               354045                                                                         LeuAlaGluAspLeuCysValGlnAlaAlaLysAlaSerAlaIleLeu                               505560                                                                         ProValTyrHisSerLeuPheAlaLeuAlaThrGluAspLeuSerCys                               65707580                                                                       TrpPheProArgAlaThrSerSerProTrpArgMetProAlaProGln                               859095                                                                         ValLeuLeuTyrArgIleArgPheTyrPheProAsnTrpPheGlyLeu                               100105110                                                                      GluLysCysHisArgPheGlyLeuArgLysAspLeuAlaSerAlaIle                               115120125                                                                      LeuAspLeuProValLeuGluHisLeuPheAlaGlnHisArgSerAsp                               130135140                                                                      LeuValSerGlyArgLeuProArgGlyLeuSerLeuLysGluGlnGly                               145150155160                                                                   GluCysLeuSerLeuAlaValLeuAspLeuAlaArgMetAlaArgGlu                               165170175                                                                      GlnAlaGlnArgArgGlyGluLeuLeuLysThrValSerTyrLysAla                               180185190                                                                      CysLeuProProSerLeuArgAspLeuIleGlnGlyLeuSerPheVal                               195200205                                                                      ThrGlyArgArgIleArgArgThrValGluSerProLeuArgArgVal                               210215220                                                                      AlaAlaCysGlnAlaAspArgHisSerLeuMetAlaLysTyrIleMet                               225230235240                                                                   AspLeuGluArgLeuAspProAlaGlyAlaAlaGluThrPheHisVal                               245250255                                                                      GlyLeuProGlyAlaLeuGlyGlyHisAspGlyLeuGlyLeuValArg                               260265270                                                                      ValAlaGlyAspGlyGlyIleAlaTrpThrGlnGlyGluGlnGluVal                               275280285                                                                      LeuGlnProPheCysAspPheProGluIleValAspIleSerIleLys                               290295300                                                                      GlnAlaProArgValGlyProAlaGlyGluHisArgLeuValThrVal                               305310315320                                                                   ThrArgThrAspAsnGlnIleLeuGluAlaGluPheProGlyLeuPro                               325330335                                                                      GluAlaLeuSerPheValAlaLeuValAspGlyTyrPheArgLeuThr                               340345350                                                                      ThrAspSerGlnHisPhePheCysLysGluValAspProArgLeuLeu                               355360365                                                                      GluGluValAlaGluGlnCysHisGlyProIleThrLeuAspPheAla                               370375380                                                                      IleAsnLysLeuLysThrGlyGlySerArgProGlySerTyrValLeu                               385390395400                                                                   ArgArgIleProGlnAspPheAspSerPheLeuLeuThrValCysVal                               405410415                                                                      GlnAsnProLeuGlyProAspTyrLysGlyCysLeuIleArgArgSer                               420425430                                                                      ProThrGlyThrPheLeuLeuValGlyLeuSerArgProHisSerSer                               435440445                                                                      LeuArgGluLeuLeuAlaThrCysTrpAspGlyGlyLeuHisValAsp                               450455460                                                                      GlyValAlaValThrLeuThrSerCysCysIleProArgProLysGlu                               465470475480                                                                   LysSerAsnLeuIleValValGlnArgGlyHisSerProProThrSer                               485490495                                                                      SerLeuValGlnProGlnSerGlnTyrGlnLeuSerGlnMetThrPhe                               500505510                                                                      HisLysIleProAlaAspSerLeuGluTrpHisGluAsnLeuGlyHis                               515520525                                                                      GlySerPheThrLysIleTyrArgGlyCysArgHisGluValValAsp                               530535540                                                                      GlyGluAlaArgLysThrGluValLeuLeuLysValMetAspAlaLys                               545550555560                                                                   HisLysAsnCysMetGluSerPheLeuGluAlaAlaSerLeuMetSer                               565570575                                                                      GlnValSerTyrArgHisLeuValLeuLeuHisGlyValCysMetAla                               580585590                                                                      GlyAspSerThrMetValGluGluPheValHisLeuGlyAlaIleAsp                               595600605                                                                      MetTyrLeuArgLysArgGlyHisLeuValProAlaSerTrpLysLeu                               610615620                                                                      GlnValValLysGlnLeuAlaTyrAlaLeuAsnTyrLeuGluAspLys                               625630635640                                                                   GlyLeuSerHisGlyAsnValSerAlaArgLysValLeuLeuAlaArg                               645650655                                                                      GluGlyAlaAspGlySerProProPheIleLysLeuSerAspProGly                               660665670                                                                      ValSerProAlaValLeuSerLeuGluMetLeuThrAspArgIlePro                               675680685                                                                      TrpValAlaProGluCysLeuArgGluAlaGlnThrLeuSerLeuGlu                               690695700                                                                      AlaAspLysTrpGlyPheGlyAlaThrValTrpGluValPheSerGly                               705710715720                                                                   ValThrMetProIleSerAlaLeuAspProAlaLysLysLeuGlnPhe                               725730735                                                                      TyrGluAspArgGlnGlnLeuSerAlaProLysTrpThrGluLeuAla                               740745750                                                                      LeuLeuIleGlnGlnCysMetAlaTyrGluProValGlnArgProSer                               755760765                                                                      LeuArgAlaValIleArgAspLeuAsnSerLeuIleSerSerAspTyr                               770775780                                                                      GluLeuLeuSerAspHisThrTrpCysProGlyThrArgAspGlyLeu                               785790795800                                                                   TrpAsnGlyAlaGlnLeuTyrAlaCysGlnAspProThrIlePheGlu                               805810815                                                                      GluArgHisLeuLysTyrIleSerGlnLeuGlyLysGlyPhePheGly                               820825830                                                                      SerValGluLeuCysArgTyrAspProLeuGlyAspAsnThrGlyAla                               835840845                                                                      LeuValAlaValLysGlnLeuGlnHisSerGlyProAspGlnGlnArg                               850855860                                                                      AspPheGlnArgGluIleGlnIleLeuLysAlaGlnHisSerAspPhe                               865870875880                                                                   IleValLysTyrArgGlyValSerTyrGlyProGlyArgGlnSerPro                               885890895                                                                      AlaLeuValMetGluTyrLeuProSerGlyCysLeuArgAspPheLeu                               900905910                                                                      GlnArgHisArgGlyLeuAspAlaSerArgLeuLeuLeuTyrSerSer                               915920925                                                                      GlnIleCysLysGlyMetGluTyrLeuGlySerArgArgCysValHis                               930935940                                                                      ArgAspLeuAlaAlaArgAsnIleLeuValGluSerGluAlaHisVal                               945950955960                                                                   LysIleAlaAspPheGlyLeuAlaLysLeuLeuProLeuAspLysAsp                               965970975                                                                      TyrTyrValValArgGluProGlyGlnSerProIlePheTrpTyrAla                               980985990                                                                      ProGluSerLeuSerAspAsnIlePheSerArgGlnSerAspValTrp                               99510001005                                                                    SerPheGlyValValLeuTyrGluLeuPheThrTyrCysAspLysSer                               101010151020                                                                   CysSerProSerAlaGluPheLeuArgMetMetGlyCysGluArgAsp                               1025103010351040                                                               ValProArgLeuCysArgLeuLeuGluLeuLeuGluGluGlyGlnArg                               104510501055                                                                   LeuProAlaProProCysCysPro                                                       1060                                                                           (2) INFORMATION FOR SEQ ID NO:3:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 16 base pairs                                                      (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: DNA                                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3:                                        AGCCGCCTCCTTCTCT16                                                             (2) INFORMATION FOR SEQ ID NO:4:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 19 base pairs                                                      (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: DNA                                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4:                                        CGGCAGCAGCTTAGCTAGG19                                                          (2) INFORMATION FOR SEQ ID NO:5:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1082 amino acids                                                   (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5:                                        MetAlaProProSerGluGluThrProLeuIleProGlnArgSerCys                               151015                                                                         SerLeuLeuSerThrGluAlaGlyAlaLeuHisValLeuLeuProAla                               202530                                                                         ArgGlyProGlyProProGlnArgLeuSerPheSerPheGlyAspHis                               354045                                                                         LeuAlaGluAspLeuCysValGlnAlaAlaLysAlaSerAlaIleLeu                               505560                                                                         ProValTyrHisSerLeuPheAlaLeuAlaThrGluAspLeuSerCys                               65707580                                                                       TrpPheProArgAlaThrSerSerProTrpArgMetProAlaProGln                               859095                                                                         ValLeuLeuTyrArgIleArgPheTyrPheProAsnTrpPheGlyLeu                               100105110                                                                      GluLysCysHisArgPheGlyLeuArgLysAspLeuAlaSerAlaIle                               115120125                                                                      LeuAspLeuProValLeuGluHisLeuPheAlaGlnHisArgSerAsp                               130135140                                                                      LeuValSerGlyArgLeuProArgGlyLeuSerLeuLysGluGlnGly                               145150155160                                                                   GluCysLeuSerLeuAlaValLeuAspLeuAlaArgMetAlaArgGlu                               165170175                                                                      GlnAlaGlnArgArgGlyGluLeuLeuLysThrValSerTyrLysAla                               180185190                                                                      CysLeuProProSerLeuArgAspLeuIleGlnGlyLeuSerPheVal                               195200205                                                                      ThrGlyArgArgIleArgArgThrValGluSerProLeuArgArgVal                               210215220                                                                      AlaAlaCysGlnAlaAspArgHisSerLeuMetAlaLysTyrIleMet                               225230235240                                                                   AspLeuGluArgLeuAspProAlaGlyAlaAlaGluThrPheHisVal                               245250255                                                                      GlyLeuProGlyAlaLeuGlyGlyHisAspGlyLeuGlyLeuValArg                               260265270                                                                      ValAlaGlyAspGlyGlyIleAlaTrpThrGlnGlyGluGlnGluVal                               275280285                                                                      LeuGlnProPheCysAspPheProGluIleValAspIleSerIleLys                               290295300                                                                      GlnAlaProArgValGlyProAlaGlyGluHisArgLeuValThrVal                               305310315320                                                                   ThrArgThrAspAsnGlnIleLeuGluAlaGluPheProGlyLeuPro                               325330335                                                                      GluAlaLeuSerPheValAlaLeuValAspGlyTyrPheArgLeuThr                               340345350                                                                      ThrAspSerGlnHisPhePheCysLysGluValAspProArgLeuLeu                               355360365                                                                      GluGluValAlaGluGlnCysHisGlyProIleThrLeuAspPheAla                               370375380                                                                      IleAsnLysLeuLysThrGlyGlySerArgProGlySerTyrValLeu                               385390395400                                                                   ArgArgIleProGlnAspPheAspSerPheLeuLeuThrValCysVal                               405410415                                                                      GlnAsnProLeuGlyProAspTyrLysGlyCysLeuIleArgArgSer                               420425430                                                                      ProThrGlyThrPheLeuLeuValGlyLeuSerArgProHisSerSer                               435440445                                                                      LeuArgGluLeuLeuAlaThrCysTrpAspGlyGlyLeuHisValAsp                               450455460                                                                      GlyValAlaValThrLeuThrSerCysCysIleProArgProLysGlu                               465470475480                                                                   LysSerAsnLeuIleValValGlnArgGlyHisSerProProThrSer                               485490495                                                                      SerLeuValGlnProGlnSerGlnTyrGlnLeuSerGlnMetThrPhe                               500505510                                                                      HisLysIleProAlaAspSerLeuGluTrpHisGluAsnLeuGlyHis                               515520525                                                                      GlySerPheThrLysIleTyrArgGlyCysArgHisGluValValAsp                               530535540                                                                      GlyGluAlaArgLysThrGluValLeuLeuLysValMetAspAlaLys                               545550555560                                                                   HisLysAsnCysMetGluSerPheLeuGluAlaAlaSerLeuMetSer                               565570575                                                                      GlnValSerTyrArgHisLeuValLeuLeuHisGlyValCysMetAla                               580585590                                                                      GlyAspSerThrMetValGluGluPheValHisLeuGlyAlaIleAsp                               595600605                                                                      MetTyrLeuArgLysArgGlyHisLeuValProAlaSerTrpLysLeu                               610615620                                                                      GlnValValLysGlnLeuAlaTyrAlaLeuAsnTyrLeuGluAspLys                               625630635640                                                                   GlyLeuSerHisGlyAsnValSerAlaArgLysValLeuLeuAlaArg                               645650655                                                                      GluGlyAlaAspGlySerProProPheIleLysLeuSerAspProGly                               660665670                                                                      ValSerProAlaValLeuSerLeuGluMetLeuThrAspArgIlePro                               675680685                                                                      TrpValAlaProGluCysLeuArgGluAlaGlnThrLeuSerLeuGlu                               690695700                                                                      AlaAspLysTrpGlyPheGlyAlaThrValTrpGluValPheSerGly                               705710715720                                                                   ValThrMetProIleSerAlaLeuAspProAlaLysLysLeuGlnPhe                               725730735                                                                      TyrGluAspArgGlnGlnLeuSerAlaProLysTrpThrGluLeuAla                               740745750                                                                      LeuLeuIleGlnGlnCysMetAlaTyrGluProValGlnArgProSer                               755760765                                                                      LeuArgAlaValIleArgAspLeuAsnSerLeuIleSerSerAspTyr                               770775780                                                                      GluLeuLeuSerAspHisThrTrpCysProGlyThrArgAspGlyLeu                               785790795800                                                                   TrpAsnGlyAlaGlnLeuTyrAlaCysGlnAspProThrIlePheGlu                               805810815                                                                      GluArgHisLeuLysTyrIleSerGlnLeuGlyLysGlyPhePheGly                               820825830                                                                      SerValGluLeuCysArgTyrAspProLeuGlyAspAsnThrGlyAla                               835840845                                                                      LeuValAlaValLysGlnLeuGlnHisSerGlyProAspGlnGlnArg                               850855860                                                                      AspPheGlnArgGluIleGlnIleLeuLysAlaGlnHisSerAspPhe                               865870875880                                                                   IleValLysTyrArgGlyValSerTyrGlyProGlyArgGlnSerPro                               885890895                                                                      AlaLeuValMetGluTyrLeuProSerGlyCysLeuArgAspPheLeu                               900905910                                                                      GlnArgHisArgGlyLeuAspAlaSerArgLeuLeuLeuTyrSerSer                               915920925                                                                      GlnIleCysLysGlyMetGluTyrLeuGlySerArgArgCysValHis                               930935940                                                                      ArgAspLeuAlaAlaArgAsnIleLeuValGluSerGluAlaHisVal                               945950955960                                                                   LysIleAlaAspPheGlyLeuAlaLysLeuLeuProLeuAspLysAsp                               965970975                                                                      TyrTyrValValArgGluProGlyGlnSerProIlePheTrpTyrAla                               980985990                                                                      ProGluSerLeuSerAspAsnIlePheSerArgGlnSerAspValTrp                               99510001005                                                                    SerPheGlyValValLeuTyrGluLeuPheThrTyrCysAspLysSer                               101010151020                                                                   CysSerProSerAlaGluPheLeuArgMetMetGlyCysGluArgAsp                               1025103010351040                                                               ValProArgLeuCysArgLeuLeuGluLeuLeuGluGluGlyGlnArg                               104510501055                                                                   LeuProAlaProProCysCysProAlaGluValSerCysTyrSerGly                               106010651070                                                                   TrpArgAspAspIleCysLeuProAlaGlu                                                 10751080                                                                       (2) INFORMATION FOR SEQ ID NO:6:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1129 amino acids                                                   (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6:                                        MetGlyMetAlaCysLeuThrMetThrGluMetGluAlaThrSerThr                               151015                                                                         SerProValHisGlnAsnGlyAspIleProGlySerAlaAsnSerVal                               202530                                                                         LysGlnIleGluProValLeuGlnValTyrLeuTyrHisSerLeuGly                               354045                                                                         GlnAlaGluGlyGluTyrLeuLysPheProSerGlyGluTyrValAla                               505560                                                                         GluGluIleCysValAlaAlaSerLysAlaCysGlyIleThrProVal                               65707580                                                                       TyrHisAsnMetPheAlaLeuMetSerGluThrGluArgIleTrpTyr                               859095                                                                         ProProAsnHisValPheHisIleAspGluSerThrArgHisAspIle                               100105110                                                                      LeuTyrArgIleArgPheTyrPheProHisTrpTyrCysSerGlySer                               115120125                                                                      SerArgThrTyrArgTyrGlyValSerArgGlyAlaGluAlaProLeu                               130135140                                                                      LeuAspAspPheValMetSerTyrLeuPheValGlnTrpArgHisAsp                               145150155160                                                                   PheValHisGlyTrpIleLysValProValThrHisGluThrGlnGlu                               165170175                                                                      GluCysLeuGlyMetAlaValLeuAspMetMetArgIleAlaLysGlu                               180185190                                                                      LysAspGlnThrProLeuAlaValTyrAsnSerValSerTyrLysThr                               195200205                                                                      PheLeuProLysCysValArgAlaLysIleGlnAspTyrHisIleLeu                               210215220                                                                      ThrArgLysArgIleArgTyrArgPheArgArgPheIleGlnGlnPhe                               225230235240                                                                   SerGlnCysLysAlaThrAlaArgAsnLeuLysLeuLysTyrLeuIle                               245250255                                                                      AsnLeuGluThrLeuGlnSerAlaPheTyrThrGluGlnPheGluVal                               260265270                                                                      LysGluSerAlaArgGlyProSerGlyGluGluIlePheAlaThrIle                               275280285                                                                      IleIleThrGlyAsnGlyGlyIleGlnTrpSerArgGlyLysHisLys                               290295300                                                                      GluSerGluThrLeuThrGluGlnAspValGlnLeuTyrCysAspPhe                               305310315320                                                                   ProAspIleIleAspValSerIleLysGlnAlaAsnGlnGluCysSer                               325330335                                                                      AsnGluSerArgIleValThrValHisLysGlnAspGlyLysValLeu                               340345350                                                                      GluIleGluLeuSerSerLeuLysGluAlaLeuSerPheValSerLeu                               355360365                                                                      IleAspGlyTyrTyrArgLeuThrAlaAspAlaHisHisTyrLeuCys                               370375380                                                                      LysGluValAlaProProAlaValLeuGluAsnIleHisSerAsnCys                               385390395400                                                                   HisGlyProIleSerMetAspPheAlaIleSerLysLeuLysLysAla                               405410415                                                                      GlyAsnGlnThrGlyLeuTyrValLeuArgCysSerProLysAspPhe                               420425430                                                                      AsnLysTyrPheLeuThrPheAlaValGluArgGluAsnValIleGlu                               435440445                                                                      TyrLysHisCysLeuIleThrLysAsnGluAsnGlyGluTyrAsnLeu                               450455460                                                                      SerGlyThrAsnArgAsnPheSerAsnLeuLysAspLeuLeuAsnCys                               465470475480                                                                   TyrGlnMetGluThrValArgSerAspSerIleIlePheGlnPheThr                               485490495                                                                      LysCysCysProProLysProLysAspLysSerAsnLeuLeuValPhe                               500505510                                                                      ArgThrAsnGlyIleSerAspValGlnIleSerProThrLeuGlnArg                               515520525                                                                      HisAsnAsnValAsnGlnMetValPheHisLysIleArgAsnGluAsp                               530535540                                                                      LeuIlePheAsnGluSerLeuGlyGlnGlyThrPheThrLysIlePhe                               545550555560                                                                   LysGlyValArgArgGluValGlyAspTyrGlyGlnLeuHisLysThr                               565570575                                                                      GluValLeuLeuLysValLeuAspLysAlaHisArgAsnTyrSerGlu                               580585590                                                                      SerPhePheGluAlaAlaSerMetMetSerGlnLeuSerHisLysHis                               595600605                                                                      LeuValLeuAsnTyrGlyValCysValCysGlyGluGluAsnIleLeu                               610615620                                                                      ValGlnGluPheValLysPheGlySerLeuAspThrTyrLeuLysLys                               625630635640                                                                   AsnLysAsnSerIleAsnIleLeuTrpLysLeuGlyValAlaLysGln                               645650655                                                                      LeuAlaTrpAlaMetHisPheLeuGluGluLysSerLeuIleHisGly                               660665670                                                                      AsnValCysAlaLysAsnIleLeuLeuIleArgGluGluAspArgArg                               675680685                                                                      ThrGlyAsnProProPheIleLysLeuSerAspProGlyIleSerIle                               690695700                                                                      ThrValLeuProLysAspIleLeuGlnGluArgIleProTrpValPro                               705710715720                                                                   ProGluCysIleGluAsnProLysAsnLeuAsnLeuAlaThrAspLys                               725730735                                                                      TrpSerPheGlyThrThrLeuTrpGluIleCysSerGlyGlyAspLys                               740745750                                                                      ProLeuSerAlaLeuAspSerGlnArgLysLeuGlnPheTyrGluAsp                               755760765                                                                      LysHisGlnLeuProAlaProLysTrpThrGluLeuAlaAsnLeuIle                               770775780                                                                      AsnAsnCysMetAspTyrGluProAspPheArgProAlaPheArgAla                               785790795800                                                                   ValIleArgAspLeuAsnSerLeuPheThrProAspTyrGluLeuLeu                               805810815                                                                      ThrGluAsnAspMetLeuProAsnMetArgIleGlyAlaLeuGlyPhe                               820825830                                                                      SerGlyAlaPheGluAspArgAspProThrGlnPheGluGluArgHis                               835840845                                                                      LeuLysPheLeuGlnGlnLeuGlyLysGlyAsnPheGlySerValGlu                               850855860                                                                      MetCysArgTyrAspProLeuGlnAspAsnThrGlyGluValValAla                               865870875880                                                                   ValLysLysLeuGlnHisSerThrGluGluHisLeuArgAspPheGlu                               885890895                                                                      ArgGluIleGluIleLeuLysSerLeuGlnHisAspAsnIleValLys                               900905910                                                                      TyrLysGlyValCysTyrSerAlaGlyArgArgAsnLeuArgLeuIle                               915920925                                                                      MetGluTyrLeuProTyrGlySerLeuArgAspTyrLeuGlnLysHis                               930935940                                                                      LysGluArgIleAspHisLysLysLeuLeuGlnTyrThrSerGlnIle                               945950955960                                                                   CysLysGlyMetGluTyrLeuGlyThrLysArgTyrIleHisArgAsp                               965970975                                                                      LeuAlaThrArgAsnIleLeuValGluAsnGluAsnArgValLysIle                               980985990                                                                      GlyAspPheGlyLeuThrLysValLeuProGlnAspLysGluTyrTyr                               99510001005                                                                    LysValLysGluProGlyGluSerProIlePheTrpTyrAlaProGln                               101010151020                                                                   SerLeuThrGluSerLysPheSerValAlaSerAspValTrpSerPhe                               1025103010351040                                                               GlyValValLeuTyrGluLeuPheThrTyrIleGluLysSerLysSer                               104510501055                                                                   ProProValGluPheMetArgMetIleGlyAsnAspLysGlnGlyGln                               106010651070                                                                   MetIleValPheHisLeuIleGluLeuLeuLysSerAsnGlyArgLeu                               107510801085                                                                   ProArgProGluGlyCysProAspGluIleTyrValIleMetThrGlu                               109010951100                                                                   CysTrpAsnAsnAsnValSerGlnArgProSerPheArgAspLeuSer                               1105111011151120                                                               PheGlyTrpIleLysCysGlyThrVal                                                    1125                                                                           (2) INFORMATION FOR SEQ ID NO:7:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1154 amino acids                                                   (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7:                                        MetGlnTyrLeuAsnIleLysGluAspCysAsnAlaMetAlaPheCys                               151015                                                                         AlaLysMetArgSerSerLysLysThrGluValAsnLeuGluAlaPro                               202530                                                                         GluProGlyValGluValIlePheTyrLeuSerAspArgGluProLeu                               354045                                                                         ArgLeuGlySerGlyGluTyrThrAlaGluGluLeuCysIleArgAla                               505560                                                                         AlaGlnAlaCysArgIleSerProLeuCysHisAsnLeuPheAlaLeu                               65707580                                                                       TyrAspGluAsnThrLysLeuTrpTyrAlaProAsnArgThrIleThr                               859095                                                                         ValAspAspLysMetSerLeuArgLeuHisTyrArgMetArgPheTyr                               100105110                                                                      PheThrAsnTrpHisGlyThrAsnAspAsnGluGlnSerValTrpArg                               115120125                                                                      HisSerProLysLysGlnLysAsnGlyTyrGluLysLysLysIlePro                               130135140                                                                      AspAlaThrProLeuLeuAspAlaSerSerLeuGluTyrLeuPheAla                               145150155160                                                                   GlnGlyGlnTyrAspLeuValLysCysLeuAlaProIleArgAspPro                               165170175                                                                      LysThrGluGlnAspGlyHisAspIleGluAsnGluCysLeuGlyMet                               180185190                                                                      AlaValLeuAlaIleSerHisTyrAlaMetMetLysLysMetGlnLeu                               195200205                                                                      ProGluLeuProLysAspIleSerTyrLysArgTyrIleProGluThr                               210215220                                                                      LeuAsnLysSerIleArgGlnArgAsnLeuLeuThrArgMetArgIle                               225230235240                                                                   AsnAsnValPheLysAspPheLeuLysGluPheAsnAsnLysThrIle                               245250255                                                                      CysAspSerSerValSerThrHisAspLeuLysValLysTyrLeuAla                               260265270                                                                      ThrLeuGluThrLeuThrLysHisTyrGlyAlaGluIlePheGluThr                               275280285                                                                      SerMetLeuLeuIleSerSerGluAsnGluMetAsnTrpPheHisSer                               290295300                                                                      AsnAspGlyGlyAsnValLeuTyrTyrGluValMetValThrGlyAsn                               305310315320                                                                   LeuGlyIleGlnTrpArgHisLysProAsnValValSerValGluLys                               325330335                                                                      GluLysAsnLysLeuLysArgLysLysLeuGluAsnLysAspLysLys                               340345350                                                                      AspGluGluLysAsnLysIleArgGluGluTrpAsnAsnPheSerPhe                               355360365                                                                      PheProGluIleThrHisIleValIleLysGluSerValValSerIle                               370375380                                                                      AsnLysGlnAspAsnLysLysMetGluLeuLysLeuSerSerHisGlu                               385390395400                                                                   GluAlaLeuSerPheValSerLeuValAspGlyTyrPheArgLeuThr                               405410415                                                                      AlaAspAlaHisHisTyrLeuCysThrAspValAlaProProLeuIle                               420425430                                                                      ValHisAsnIleGlnAsnGlyCysHisGlyProIleCysThrGluTyr                               435440445                                                                      AlaIleAsnLysLeuArgGlnGluGlySerGluGluGlyMetTyrVal                               450455460                                                                      LeuArgTrpSerCysThrAspPheAspAsnIleLeuMetThrValThr                               465470475480                                                                   CysPheGluLysSerGluGlnValGlnGlyAlaGlnLysGlnPheLys                               485490495                                                                      AsnPheGlnIleGluValGlnLysGlyArgTyrSerLeuHisGlySer                               500505510                                                                      AspArgSerPheProSerLeuGlyAspLeuMetSerHisLeuLysLys                               515520525                                                                      GlnIleLeuArgThrAspAsnIleSerPheMetLeuLysArgCysCys                               530535540                                                                      GlnProLysProArgGluIleSerAsnLeuLeuValAlaThrLysLys                               545550555560                                                                   AlaGlnGluTrpGlnProValTyrProMetSerGlnLeuSerPheAsp                               565570575                                                                      ArgIleLeuLysLysAspLeuValGlnGlyGluHisLeuGlyArgGly                               580585590                                                                      ThrArgThrHisIleTyrSerGlyThrLeuMetAspTyrLysAspAsp                               595600605                                                                      GluGlyThrSerGluGluLysLysIleLysValIleLeuLysValLeu                               610615620                                                                      AspProSerHisArgAspIleSerLeuAlaPhePheGluAlaAlaSer                               625630635640                                                                   MetMetArgGlnValSerHisLysHisIleValTyrLeuTyrGlyVal                               645650655                                                                      CysValArgAspValGluAsnIleMetValGluGluPheValGluGly                               660665670                                                                      GlyProLeuAspLeuPheMetHisArgLysSerAspValLeuThrThr                               675680685                                                                      ProTrpLysPheLysValAlaLysGlnLeuAlaSerAlaLeuSerTyr                               690695700                                                                      LeuGluAspLysAspLeuValHisGlyAsnValCysThrLysAsnLeu                               705710715720                                                                   LeuLeuAlaArgGluGlyIleAspSerGluCysGlyProPheIleLys                               725730735                                                                      LeuSerAspProGlyIleProIleThrValLeuSerArgGlnGluCys                               740745750                                                                      IleGluArgIleProTrpIleAlaProGluCysValGluAspSerLys                               755760765                                                                      AsnLeuSerValAlaAlaAspLysTrpSerPheGlyThrThrLeuTrp                               770775780                                                                      GluIleCysTyrAsnGlyGluIleProLeuLysAspLysThrLeuIle                               785790795800                                                                   GluLysGluArgPheTyrGluSerArgCysArgProValThrProSer                               805810815                                                                      CysLysGluLeuAlaAspLeuMetThrArgCysMetAsnTyrAspPro                               820825830                                                                      AsnGlnArgProPhePheArgAlaIleMetArgAspIleAsnLysLeu                               835840845                                                                      GluGluGlnAsnProAspIleValSerArgLysLysAsnGlnProThr                               850855860                                                                      GluValAspProThrHisPheGluLysArgPheLeuLysArgIleArg                               865870875880                                                                   AspLeuGlyGluGlyHisPheGlyLysValGluLeuCysArgTyrAsp                               885890895                                                                      ProGluAspAsnThrGlyGluGlnValAlaValLysSerLeuLysPro                               900905910                                                                      GluSerGlyGlyAsnHisIleAlaAspLeuLysLysGluIleGluIle                               915920925                                                                      LeuArgAsnLeuTyrHisGluAsnIleValLysTyrLysGlyIleCys                               930935940                                                                      ThrGluAspGlyGlyAsnGlyIleLysLeuIleMetGluPheLeuPro                               945950955960                                                                   SerGlySerLeuLysGluTyrLeuProLysAsnLysAsnLysIleAsn                               965970975                                                                      LeuLysGlnGlnLeuLysTyrAlaValGlnIleCysLysGlyMetAsp                               980985990                                                                      TyrLeuGlySerArgGlnTyrValHisArgAspLeuAlaAlaArgAsn                               99510001005                                                                    ValLeuValGluSerGluHisGlnValLysIleGlyAspPheGlyLeu                               101010151020                                                                   ThrLysAlaIleGluThrAspLysGluTyrTyrThrValLysAspAsp                               1025103010351040                                                               ArgAspSerProValPheTrpTyrAlaProGluCysLeuMetGlnSer                               104510501055                                                                   LysPheTyrIleAlaSerAspValTrpSerPheGlyValThrLeuHis                               106010651070                                                                   GluLeuLeuThrTyrCysAspSerAspSerSerProMetAlaLeuPhe                               107510801085                                                                   LeuLysMetIleGlyProThrHisGlyGlnMetThrValThrArgLeu                               109010951100                                                                   ValAsnThrLeuLysGluGlyLysArgLeuProCysProProAsnCys                               1105111011151120                                                               ProAspGluValTyrGlnLeuMetArgLysCysTrpGluPheGlnPro                               112511301135                                                                   SerAsnArgThrSerPheGlnAsnLeuIleGluGlyPheGluAlaLeu                               114011451150                                                                   LeuLys                                                                         (2) INFORMATION FOR SEQ ID NO:8:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1187 amino acids                                                   (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8:                                        MetProLeuArgHisTrpGlyMetAlaArgGlySerLysProValGly                               151015                                                                         AspGlyAlaGlnProMetAlaAlaMetGlyGlyLeuLysValLeuLeu                               202530                                                                         HisTrpAlaGlyProGlyGlyGlyGluProTrpValThrPheSerGlu                               354045                                                                         SerSerLeuThrAlaGluGluValCysIleHisIleAlaHisLysVal                               505560                                                                         GlyIleThrProProCysPheAsnLeuPheAlaLeuPheAspAlaGln                               65707580                                                                       AlaGlnValTrpLeuProProAsnHisIleLeuGluIleProArgAsp                               859095                                                                         AlaSerLeuMetLeuTyrPheArgIleArgPheTyrPheArgAsnTrp                               100105110                                                                      HisGlyMetAsnProArgGluProAlaValTyrArgCysGlyProPro                               115120125                                                                      GlyThrGluAlaSerSerAspGlnThrAlaGlnGlyMetGlnLeuLeu                               130135140                                                                      AspProAlaSerPheGluTyrLeuPheGluGlnGlyLysHisGluPhe                               145150155160                                                                   ValAsnAspValAlaSerLeuTrpGluLeuSerThrGluGluGluIle                               165170175                                                                      HisHisPheLysAsnGluSerLeuGlyMetAlaPheLeuHisLeuCys                               180185190                                                                      HisLeuAlaLeuArgHisGlyIleProLeuGluGluValAlaLysLys                               195200205                                                                      ThrSerPheLysAspCysIleProArgSerPheArgArgHisIleArg                               210215220                                                                      GlnHisSerAlaLeuThrArgLeuArgLeuArgAsnValPheArgArg                               225230235240                                                                   PheLeuArgAspPheGlnProGlyArgLeuSerGlnGlnMetValMet                               245250255                                                                      ValLysTyrLeuAlaThrLeuGluArgLeuAlaProArgPheGlyThr                               260265270                                                                      GluArgValProValCysHisLeuArgLeuLeuAlaGlnAlaGluGly                               275280285                                                                      GluProCysTyrIleArgAspSerGlyValAlaProThrAspProGly                               290295300                                                                      ProGluSerAlaAlaGlyProProThrHisGluValLeuValThrGly                               305310315320                                                                   ThrGlyGlyIleGlnTrpTrpProValGluGluGluValAsnLysGlu                               325330335                                                                      GluGlySerSerGlySerSerGlyArgAsnProGlnAlaSerLeuPhe                               340345350                                                                      GlyLysLysAlaLysAlaHisLysAlaPheGlyGlnProAlaAspArg                               355360365                                                                      ProArgGluProLeuTrpAlaTyrPheCysAspPheArgAspIleThr                               370375380                                                                      HisValValLeuLysGluHisCysValSerIleHisArgGlnAspAsn                               385390395400                                                                   LysCysLeuGluLeuSerLeuProSerArgAlaAlaAlaLeuSerPhe                               405410415                                                                      ValSerLeuValAspGlyTyrPheArgLeuThrAlaAspSerSerHis                               420425430                                                                      TyrLeuCysHisGluValAlaProProArgLeuValMetSerIleArg                               435440445                                                                      AspGlyIleHisGlyProLeuLeuGluProPheValGlnAlaLysLeu                               450455460                                                                      ArgProGluAspGlyLeuTyrLeuIleHisTrpSerThrSerHisPro                               465470475480                                                                   TyrArgLeuIleLeuThrValAlaGlnArgSerGlnAlaProAspGly                               485490495                                                                      MetGlnSerLeuArgLeuArgLysPheProIleGluGlnGlnAspGly                               500505510                                                                      AlaPheValLeuGluGlyTrpGlyArgSerPheProSerValArgGlu                               515520525                                                                      LeuGlyAlaAlaLeuGlnGlyCysLeuLeuArgAlaGlyAspAspCys                               530535540                                                                      PheSerLeuArgArgCysCysLeuProGlnProGlyGluThrSerAsn                               545550555560                                                                   LeuIleIleMetArgGlyAlaArgAlaSerProArgThrLeuAsnLeu                               565570575                                                                      SerGlnLeuSerPheHisArgValAspGlnLysGluIleThrGlnLeu                               580585590                                                                      SerHisLeuGlyGlnGlyThrArgThrAsnValTyrGluGlyArgLeu                               595600605                                                                      ArgValGluGlySerGlyAspProGluGluGlyLysMetAspAspGlu                               610615620                                                                      AspProLeuValProGlyArgAspArgGlyGlnGluLeuArgValVal                               625630635640                                                                   LeuLysValLeuAspProSerHisHisAspIleAlaLeuAlaPheTyr                               645650655                                                                      GluThrAlaSerLeuMetSerGlnValSerHisThrHisLeuAlaPhe                               660665670                                                                      ValHisGlyValCysValArgGlyProGluAsnSerMetValThrGlu                               675680685                                                                      TyrValGluHisGlyProLeuAspValTrpLeuArgArgGluArgGly                               690695700                                                                      HisValProMetAlaTrpLysMetValValAlaGlnGlnLeuAlaSer                               705710715720                                                                   AlaLeuSerTyrLeuGluAsnLysAsnLeuValHisGlyAsnValCys                               725730735                                                                      GlyArgAsnIleLeuLeuAlaArgLeuGlyLeuAlaGluGlyThrSer                               740745750                                                                      ProPheIleLysLeuSerAspProGlyValGlyLeuGlyAlaLeuSer                               755760765                                                                      ArgGluGluArgValGluArgIleProTrpLeuAlaProGluCysLeu                               770775780                                                                      ProGlyGlyAlaAsnSerLeuSerThrAlaMetAspLysTrpGlyPhe                               785790795800                                                                   GlyAlaThrLeuLeuGluIleCysPheAspGlyGluAlaProLeuGln                               805810815                                                                      SerArgSerProSerGluLysGluHisPheTyrGlnArgGlnHisArg                               820825830                                                                      LeuProGluProSerCysProGlnLeuAlaThrLeuThrSerGlnCys                               835840845                                                                      LeuThrTyrGluProThrGlnArgProSerPheArgThrIleLeuArg                               850855860                                                                      AspLeuThrArgValGlnProHisAsnLeuAlaAspValLeuThrVal                               865870875880                                                                   AsnArgAspSerProAlaValGlyProThrThrPheHisLysArgTyr                               885890895                                                                      LeuLysLysIleArgAspLeuGlyGluGlyHisPheGlyLysValSer                               900905910                                                                      LeuTyrCysTyrAspProThrAsnAspGlyThrGlyGluMetValAla                               915920925                                                                      ValLysAlaLeuLysAlaAspCysGlyProGlnHisArgSerGlyTrp                               930935940                                                                      LysGlnGluIleAspIleLeuArgThrLeuTyrHisGluHisIleIle                               945950955960                                                                   LysTyrLysGlyCysCysGluAspGlnGlyGluLysSerLeuGlnLeu                               965970975                                                                      ValMetGluTyrValProLeuGlySerLeuArgAspTyrLeuProArg                               980985990                                                                      HisSerIleGlyLeuAlaGlnLeuLeuLeuPheAlaGlnGlnIleCys                               99510001005                                                                    GluGlyMetAlaTyrLeuHisAlaHisAspTyrIleHisArgAspLeu                               101010151020                                                                   AlaAlaArgAsnValLeuLeuAspAsnAspArgLeuValLysIleGly                               1025103010351040                                                               AspPheGlyLeuAlaLysAlaValProGluGlyHisGluTyrTyrArg                               104510501055                                                                   ValArgGluAspGlyAspSerProValPheTrpTyrAlaProGluCys                               106010651070                                                                   LeuLysGluTyrLysPheTyrTyrAlaSerAspValTrpSerPheGly                               107510801085                                                                   ValThrLeuTyrGluLeuLeuThrHisCysAspSerSerGlnSerPro                               109010951100                                                                   ProThrLysPheLeuGluLeuIleGlyIleAlaGlnGlyGlnMetThr                               1105111011151120                                                               ValLeuArgLeuThrGluLeuLeuGluArgGlyGluArgLeuProArg                               112511301135                                                                   ProAspLysCysProCysGluValTyrHisLeuMetLysAsnCysTrp                               114011451150                                                                   GluThrGluAlaSerPheArgProThrPheGluAsnLeuIleProIle                               115511601165                                                                   LeuLysThrValHisGluLysTyrGlnGlyGlnAlaProSerValPhe                               117011751180                                                                   SerValCys                                                                      1185                                                                           (2) INFORMATION FOR SEQ ID NO:9:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 498 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9:                                        MetProLeuGlyAlaGluGluCysAlaAlaIleProHisAsnLeuPhe                               151015                                                                         AlaLeuTrpProProAsnLeuTyrArgIleArgPheTyrPheAsnTrp                               202530                                                                         GlyLeuLeuAspGluTyrLeuPheGlnAspValGluGlnGluCysLeu                               354045                                                                         GlyMetAlaValLeuAlaGluSerTyrLysProArgIleLeuThrArg                               505560                                                                         ArgIleArgPhePheLeuPheLeuLysLysTyrLeuLeuGluLeuGlu                               65707580                                                                       PheValValValThrGlyGlyGlyIleGlnTrpGluPheCysAspPhe                               859095                                                                         ProIleIleLysValGlnAspAsnLysLeuGluLeuSerGluAlaLeu                               100105110                                                                      SerPheValSerLeuValAspGlyTyrPheArgLeuThrAlaAspHis                               115120125                                                                      TyrLeuCysValAlaProProIleCysHisGlyProIlePheAlaIle                               130135140                                                                      LysLeuGlyTyrValLeuArgTrpSerAspPheLeuThrValValLys                               145150155160                                                                   IleGlyLeuGlyArgPheSerLeuArgPheCysCysProProSerAsn                               165170175                                                                      LeuLeuValGlnSerGlnPheHisIleLeuGluLeuGlyGlyThrThr                               180185190                                                                      IleTyrGlyAspValLeuLysValLeuAspHisPheGluAlaAlaSer                               195200205                                                                      MetSerGlnValSerHisHisLeuValGlyValCysValGluAsnVal                               210215220                                                                      GluPheValGlyLeuAspArgTrpLysValAlaLysGlnLeuAlaAla                               225230235240                                                                   LeuTyrLeuGluAspLeuLeuHisGlyAsnValCysAsnIleLeuLeu                               245250255                                                                      AlaArgGluGlyProPheIleLysLeuSerAspProGlyValLeuSer                               260265270                                                                      GluArgIleProTrpAlaProGluCysAsnLeuSerAlaAspLysTrp                               275280285                                                                      PheGlyThrLeuTrpGluCysGlyProLeuLysPheTyrGluLeuPro                               290295300                                                                      GluLeuAlaLeuCysMetTyrGluProGlnArgProPheArgAlaArg                               305310315320                                                                   AspLeuAsnLeuProAspProThrPheGluArgLeuLysIleLeuGly                               325330335                                                                      GlyPheGlyValGluLeuCysArgTyrAspProAspAsnThrGlyGlu                               340345350                                                                      ValAlaValLysLeuSerGlyHisAspGluIleIleLeuLeuHisIle                               355360365                                                                      ValLysTyrLysGlyCysGlyLeuMetGluTyrLeuProGlySerLeu                               370375380                                                                      ArgAspTyrLeuIleLeuLeuLeuTyrLeuLeuGlnIleCysLysGly                               385390395400                                                                   MetTyrLeuGlyTyrHisArgAspLeuAlaAlaArgAsnLeuValGlu                               405410415                                                                      GluValLysIleGlyAspPheGlyLeuLysProAspLysGluTyrTyr                               420425430                                                                      ValGluGlySerProPheTrpTyrAlaProGluLeuLeuPheAlaSer                               435440445                                                                      AspValTrpSerPheGlyValLeuTyrGluLeuThrTyrCysAspSer                               450455460                                                                      SerProPheLeuMetIleGlyGlyGlnMetValArgLeuGluLeuLeu                               465470475480                                                                   GlyArgLeuProProCysProGluValTyrLeuMetCysTrpSerArg                               485490495                                                                      PheLeu                                                                         (2) INFORMATION FOR SEQ ID NO:10:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1082 amino acids                                                   (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10:                                       MetAlaProProSerGluGluThrProLeuIleProGlnArgSerCys                               151015                                                                         SerLeuLeuSerThrGluAlaGlyAlaLeuHisValLeuLeuProAla                               202530                                                                         ArgGlyProGlyProProGlnArgLeuSerPheSerPheGlyAspHis                               354045                                                                         LeuAlaGluAspLeuCysValGlnAlaAlaLysAlaSerAlaIleLeu                               505560                                                                         ProValTyrHisSerLeuPheAlaLeuAlaThrGluAspLeuSerCys                               65707580                                                                       TrpPheProArgAlaThrSerSerProTrpArgMetProAlaProGln                               859095                                                                         ValLeuLeuTyrArgIleArgPheTyrPheProAsnTrpPheGlyLeu                               100105110                                                                      GluLysCysHisArgPheGlyLeuArgLysAspLeuAlaSerAlaIle                               115120125                                                                      LeuAspLeuProValLeuGluHisLeuPheAlaGlnHisArgSerAsp                               130135140                                                                      LeuValSerGlyArgLeuProArgGlyLeuSerLeuLysGluGlnGly                               145150155160                                                                   GluCysLeuSerLeuAlaValLeuAspLeuAlaArgMetAlaArgGlu                               165170175                                                                      GlnAlaGlnArgArgGlyGluLeuLeuLysThrValSerTyrLysAla                               180185190                                                                      CysLeuProProSerLeuArgAspLeuIleGlnGlyLeuSerPheVal                               195200205                                                                      ThrGlyArgArgIleArgArgThrValGluSerProLeuArgArgVal                               210215220                                                                      AlaAlaCysGlnAlaAspArgHisSerLeuMetAlaLysTyrIleMet                               225230235240                                                                   AspLeuGluArgLeuAspProAlaGlyAlaAlaGluThrPheHisVal                               245250255                                                                      GlyLeuProGlyAlaLeuGlyGlyHisAspGlyLeuGlyLeuValArg                               260265270                                                                      ValAlaGlyAspGlyGlyIleAlaTrpThrGlnGlyGluGlnGluVal                               275280285                                                                      LeuGlnProPheCysAspPheProGluIleValAspIleSerIleLys                               290295300                                                                      GlnAlaProArgValGlyProAlaGlyGluHisArgLeuValThrVal                               305310315320                                                                   ThrArgThrAspAsnGlnIleLeuGluAlaGluPheProGlyLeuPro                               325330335                                                                      GluAlaLeuSerPheValAlaLeuValAspGlyTyrPheArgLeuThr                               340345350                                                                      ThrAspSerGlnHisPhePheCysLysGluValAspProArgLeuLeu                               355360365                                                                      GluGluValAlaGluGlnCysHisGlyProIleThrLeuAspPheAla                               370375380                                                                      IleAsnLysLeuLysThrGlyGlySerArgProGlySerTyrValLeu                               385390395400                                                                   ArgArgIleProGlnAspPheAspSerPheLeuLeuThrValCysVal                               405410415                                                                      GlnAsnProLeuGlyProAspTyrLysGlyCysLeuIleArgArgSer                               420425430                                                                      ProThrGlyThrPheLeuLeuValGlyLeuSerArgProHisSerSer                               435440445                                                                      LeuArgGluLeuLeuAlaThrCysTrpAspGlyGlyLeuHisValAsp                               450455460                                                                      GlyValAlaValThrLeuThrSerCysCysIleProArgProLysGlu                               465470475480                                                                   LysSerAsnLeuIleValValGlnArgGlyHisSerProProThrSer                               485490495                                                                      SerLeuValGlnProGlnSerGlnTyrGlnLeuSerGlnMetThrPhe                               500505510                                                                      HisLysIleProAlaAspSerLeuGluTrpHisGluAsnLeuGlyHis                               515520525                                                                      GlySerPheThrLysIleTyrArgGlyCysArgHisGluValValAsp                               530535540                                                                      GlyGluAlaArgLysThrGluValLeuLeuLysValMetAspAlaLys                               545550555560                                                                   HisLysAsnCysMetGluSerPheLeuGluAlaAlaSerLeuMetSer                               565570575                                                                      GlnValSerTyrArgHisLeuValLeuLeuHisGlyValCysMetAla                               580585590                                                                      GlyAspSerThrMetValGluGluPheValHisLeuGlyAlaIleAsp                               595600605                                                                      MetTyrLeuArgLysArgGlyHisLeuValProAlaSerTrpLysLeu                               610615620                                                                      GlnValValLysGlnLeuAlaTyrAlaLeuAsnTyrLeuGluAspLys                               625630635640                                                                   GlyLeuSerHisGlyAsnValSerAlaArgLysValLeuLeuAlaArg                               645650655                                                                      GluGlyAlaAspGlySerProProPheIleLysLeuSerAspProGly                               660665670                                                                      ValSerProAlaValLeuSerLeuGluMetLeuThrAspArgIlePro                               675680685                                                                      TrpValAlaProGluCysLeuArgGluAlaGlnThrLeuSerLeuGlu                               690695700                                                                      AlaAspLysTrpGlyPheGlyAlaThrValTrpGluValPheSerGly                               705710715720                                                                   ValThrMetProIleSerAlaLeuAspProAlaLysLysLeuGlnPhe                               725730735                                                                      TyrGluAspArgGlnGlnLeuSerAlaProLysTrpThrGluLeuAla                               740745750                                                                      LeuLeuIleGlnGlnCysMetAlaTyrGluProValGlnArgProSer                               755760765                                                                      LeuArgAlaValIleArgAspLeuAsnSerLeuIleSerSerAspTyr                               770775780                                                                      GluLeuLeuSerAspHisThrTrpCysProGlyThrArgAspGlyLeu                               785790795800                                                                   TrpAsnGlyAlaGlnLeuTyrAlaCysGlnAspProThrIlePheGlu                               805810815                                                                      GluArgHisLeuLysTyrIleSerGlnLeuGlyLysGlyPhePheGly                               820825830                                                                      SerValGluLeuCysArgTyrAspProLeuGlyAspAsnThrGlyAla                               835840845                                                                      LeuValAlaValLysGlnLeuGlnHisSerGlyProAspGlnGlnArg                               850855860                                                                      AspPheGlnArgGluIleGlnIleLeuLysAlaGlnHisSerAspPhe                               865870875880                                                                   IleValLysTyrArgGlyValSerTyrGlyProGlyArgGlnSerPro                               885890895                                                                      AlaLeuValMetGluTyrLeuProSerGlyCysLeuArgAspPheLeu                               900905910                                                                      GlnArgHisArgGlyLeuAspAlaSerArgLeuLeuLeuTyrSerSer                               915920925                                                                      GlnIleCysLysGlyMetGluTyrLeuGlySerArgArgCysValHis                               930935940                                                                      ArgAspLeuAlaAlaArgAsnIleLeuValGluSerGluAlaHisVal                               945950955960                                                                   LysIleAlaAspPheGlyLeuAlaLysLeuLeuProLeuAspLysAsp                               965970975                                                                      TyrTyrValValArgGluProGlyGlnSerProIlePheTrpTyrAla                               980985990                                                                      ProGluSerLeuSerAspAsnIlePheSerArgGlnSerAspValTrp                               99510001005                                                                    SerPheGlyValValLeuTyrGluLeuPheThrTyrCysAspLysSer                               101010151020                                                                   CysSerProSerAlaGluPheLeuArgMetMetGlyCysGluArgAsp                               1025103010351040                                                               ValProArgLeuCysArgLeuLeuGluLeuLeuGluGluGlyGlnArg                               104510501055                                                                   LeuProAlaProProCysCysProAlaGluValSerCysTyrSerGly                               106010651070                                                                   TrpArgAspAspIleCysLeuProAlaGlu                                                 10751080                                                                       (2) INFORMATION FOR SEQ ID NO:11:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1100 amino acids                                                   (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11:                                       MetAlaProProSerGluGluThrProLeuIleSerGlnArgSerCys                               151015                                                                         SerLeuSerSerSerGluAlaGlyAlaLeuHisValLeuLeuProPro                               202530                                                                         ArgGlyProGlyProProGlnArgLeuSerPheSerPheGlyAspTyr                               354045                                                                         LeuAlaGluAspLeuCysValArgAlaAlaLysAlaCysGlyIleLeu                               505560                                                                         ProValTyrHisSerLeuPheAlaLeuAlaThrGluAspLeuSerCys                               65707580                                                                       TrpPheProProSerHisIlePheSerIleGluAspValAspThrGln                               859095                                                                         ValLeuValTyrArgLeuArgPheTyrPheProGlyTrpPheGlyLeu                               100105110                                                                      GluThrCysHisArgPheGlyLeuHisLysAspLeuThrSerAlaIle                               115120125                                                                      LeuAspValHisValLeuGluHisLeuPheAlaGlnHisArgSerAsp                               130135140                                                                      LeuValSerGlyArgLeuProValGlyLeuSerLeuLysAspGlnGly                               145150155160                                                                   GluPheLeuSerLeuAlaValLeuAspLeuAlaGlnMetAlaArgLys                               165170175                                                                      GlnAlaGlnArgProGlyGluLeuLeuLysSerValSerTyrLysAla                               180185190                                                                      CysLeuProProSerLeuArgAspLeuIleGlnGlyGlnSerPheVal                               195200205                                                                      ThrArgArgArgIleArgArgThrValValGlnAlaLeuAlaProCys                               210215220                                                                      SerSerLeuProSerArgProTyrAlaLeuMetAlaLysTyrIleLeu                               225230235240                                                                   AspLeuGluArgLeuHisProAlaAlaThrThrGluSerPheLeuVal                               245250255                                                                      GlyLeuProGlyAlaGlnGluGluProGlyCysLeuArgValThrGly                               260265270                                                                      AspAsnGlyIleAlaTrpSerSerLysAspGlnGluLeuPheGlnThr                               275280285                                                                      PheCysAspPheProGluIleValAspValSerIleLysGlnAlaPro                               290295300                                                                      ArgValGlyProAlaGlyGluHisArgLeuValThrIleThrArgMet                               305310315320                                                                   AspGlyHisIleLeuGluAlaGluPheProGlyLeuProGluAlaLeu                               325330335                                                                      SerPheValAlaLeuValAspGlyTyrPheArgLeuIleCysAspSer                               340345350                                                                      ArgHisPhePheCysLysGluValAlaProProArgLeuLeuGluGlu                               355360365                                                                      GluAlaGluLeuCysHisGlyProIleThrLeuAspPheAlaIleHis                               370375380                                                                      LysLeuLysAlaAlaGlySerLeuProGlySerTyrIleLeuArgArg                               385390395400                                                                   SerProGlnAspTyrAspSerPheLeuLeuThrAlaCysValGlnThr                               405410415                                                                      ProLeuGlyProAspTyrLysGlyCysLeuIleArgGlnAspProSer                               420425430                                                                      GlyAlaPheSerLeuValGlyLeuSerGlnLeuHisArgSerLeuGln                               435440445                                                                      GluLeuLeuThrAlaCysTrpHisSerGlyLeuGlnValAspGlyThr                               450455460                                                                      AlaLeuAsnLeuThrSerCysCysValProArgProLysGluLysSer                               465470475480                                                                   AsnLeuIleValValArgArgGlyArgAsnProThrProAlaProGly                               485490495                                                                      HisSerProSerCysCysAlaLeuThrLysLeuSerPheHisThrIle                               500505510                                                                      ProAlaAspSerLeuGluTrpHisGluAsnLeuGlyHisGlySerPhe                               515520525                                                                      ThrLysIlePheHisGlyHisArgArgGluValValAspGlyGluThr                               530535540                                                                      HisAspThrGluValLeuLeuLysValMetAspSerArgHisGlnAsn                               545550555560                                                                   CysMetGluSerPheLeuGluAlaAlaSerLeuMetSerGlnValSer                               565570575                                                                      TyrProHisLeuValLeuLeuHisGlyValCysMetAlaGlyAspSer                               580585590                                                                      IleMetValGlnGluPheValTyrLeuGlyAlaIleAspThrTyrLeu                               595600605                                                                      ArgLysArgGlyHisLeuValProAlaSerTrpLysLeuGlnValThr                               610615620                                                                      LysGlnLeuAlaTyrAlaLeuAsnTyrLeuGluAspLysGlyLeuPro                               625630635640                                                                   HisGlyAsnValSerAlaArgLysValLeuLeuAlaArgGluGlyVal                               645650655                                                                      AspGlyAsnProProPheIleLysLeuSerAspProGlyValSerPro                               660665670                                                                      ThrValLeuSerLeuGluMetLeuThrAspArgIleProTrpValAla                               675680685                                                                      ProGluCysLeuGlnGluAlaGlyThrLeuAsnLeuGluAlaAspLys                               690695700                                                                      TrpGlyPheGlyAlaThrThrTrpGluValPheSerGlyAlaProMet                               705710715720                                                                   HisIleThrSerLeuGluProAlaLysLysLeuLysPheTyrGluAsp                               725730735                                                                      ArgGlyGlnLeuProAlaLeuLysTrpThrGluLeuGluGlyLeuIle                               740745750                                                                      AlaGlnCysMetAlaTyrAspProGlyArgArgProSerPheArgAla                               755760765                                                                      IleLeuArgAspLeuAsnGlyLeuIleThrSerAspTyrGluLeuLeu                               770775780                                                                      SerAspProThrProGlyIleProAsnProArgAspGluLeuCysGly                               785790795800                                                                   GlyAlaGlnLeuTyrAlaCysGlnAspProAlaIlePheGluGluArg                               805810815                                                                      HisLeuLysTyrIleSerLeuLeuGlyLysGlyAsnPheGlySerVal                               820825830                                                                      GluLeuCysArgTyrAspProLeuGlyAspAsnThrGlyProLeuVal                               835840845                                                                      AlaValLysGlnLeuGlnHisSerGlyProGluGlnGlnArgAspPhe                               850855860                                                                      GlnArgGluIleGlnIleLeuLysAlaLeuHisCysAspPheIleVal                               865870875880                                                                   LysTyrArgGlyValSerTyrGlyProGlyArgGlnGluLeuArgLeu                               885890895                                                                      ValMetGluTyrLeuProSerGlyCysLeuArgAspPheLeuGlnArg                               900905910                                                                      HisArgAlaArgLeuHisAsnAspArgLeuLeuLeuPheAlaTrpGln                               915920925                                                                      IleCysLysGlyMetGluTyrLeuGlyAlaArgArgCysValHisArg                               930935940                                                                      AspLeuAlaAlaArgAsnIleLeuValGluSerGluAlaHisValLys                               945950955960                                                                   IleAlaAspPheGlyLeuAlaLysLeuLeuProLeuGlyLysAspTyr                               965970975                                                                      TyrValValArgValProGlyGlnSerProIlePheTrpTyrAlaPro                               980985990                                                                      GluSerLeuSerAspAsnIlePheSerArgGlnSerAspValTrpSer                               99510001005                                                                    PheGlyValValLeuTyrGluLeuPheThrTyrSerAspLysSerCys                               101010151020                                                                   SerProSerThrGluPheLeuArgMetIleGlyProGluArgGluGly                               1025103010351040                                                               SerProLeuCysHisLeuLeuGluLeuLeuAlaGluGlyArgArgLeu                               104510501055                                                                   ProProProSerThrCysProThrGluValGlnGluLeuMetGlnLeu                               106010651070                                                                   CysTrpSerProAsnProGlnAspArgProAlaPheAspThrLeuSer                               107510801085                                                                   ProGlnLeuAspAlaLeuTrpArgGlySerProGly                                           109010951100                                                                   (2) INFORMATION FOR SEQ ID NO:12:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 846 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: Not Relevant                                                 (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12:                                       MetAlaProProSerGluGluThrProLeuIleGlnArgSerCysSer                               151015                                                                         LeuSerGluAlaGlyAlaLeuHisValLeuLeuProArgGlyProGly                               202530                                                                         ProProGlnArgLeuSerPheSerPheGlyAspLeuAlaGluAspLeu                               354045                                                                         CysValAlaAlaLysAlaIleLeuProValTyrHisSerLeuPheAla                               505560                                                                         LeuAlaThrGluAspLeuSerCysTrpPheProGlnValLeuTyrArg                               65707580                                                                       ArgPheTyrPheProTrpPheGlyLeuGluCysHisArgPheGlyLeu                               859095                                                                         LysAspLeuSerAlaIleLeuAspValLeuGluHisLeuPheAlaGln                               100105110                                                                      HisArgSerAspLeuValSerGlyArgLeuProGlyLeuSerLeuLys                               115120125                                                                      GlnGlyGluLeuSerLeuAlaValLeuAspLeuAlaMetAlaArgGln                               130135140                                                                      AlaGlnArgGlyGluLeuLeuLysValSerTyrLysAlaCysLeuPro                               145150155160                                                                   ProSerLeuArgAspLeuIleGlnGlySerPheValThrArgArgIle                               165170175                                                                      ArgArgThrValLeuLeuMetAlaLysTyrIleAspLeuGluArgLeu                               180185190                                                                      ProAlaGluPheValGlyLeuProGlyAlaGlyArgValGlyAspGly                               195200205                                                                      IleAlaTrpGlnGluGlnPheCysAspPheProGluIleValAspSer                               210215220                                                                      IleLysGlnAlaProArgValGlyProAlaGlyGluHisArgLeuVal                               225230235240                                                                   ThrThrArgAspIleLeuGluAlaGluPheProGlyLeuProGluAla                               245250255                                                                      LeuSerPheValAlaLeuValAspGlyTyrPheArgLeuAspSerHis                               260265270                                                                      PhePheCysLysGluValProArgLeuLeuGluGluAlaGluCysHis                               275280285                                                                      GlyProIleThrLeuAspPheAlaIleLysLeuLysGlySerProGly                               290295300                                                                      SerTyrLeuArgArgProGlnAspAspSerPheLeuLeuThrCysVal                               305310315320                                                                   GlnProLeuGlyProAspTyrLysGlyCysLeuIleArgProGlyPhe                               325330335                                                                      LeuValGlyLeuSerHisSerLeuGluLeuLeuCysTrpGlyLeuVal                               340345350                                                                      AspGlyAlaLeuThrSerCysCysProArgProLysGluLysSerAsn                               355360365                                                                      LeuIleValValArgGlyProThrSerLeuPheHisIleProAlaAsp                               370375380                                                                      SerLeuGluTrpHisGluAsnLeuGlyHisGlySerPheThrLysIle                               385390395400                                                                   GlyArgGluValValAspGlyGluThrGluValLeuLeuLysValMet                               405410415                                                                      AspHisAsnCysMetGluSerPheLeuGluAlaAlaSerLeuMetSer                               420425430                                                                      GlnValSerTyrHisLeuValLeuLeuHisGlyValCysMetAlaGly                               435440445                                                                      AspSerMetValGluPheValLeuGlyAlaIleAspTyrLeuArgLys                               450455460                                                                      ArgGlyHisLeuValProAlaSerTrpLysLeuGlnValLysGlnLeu                               465470475480                                                                   AlaTyrAlaLeuAsnTyrLeuGluAspLysGlyLeuHisGlyAsnVal                               485490495                                                                      SerAlaArgLysValLeuLeuAlaArgGluGlyAspGlyProProPhe                               500505510                                                                      IleLysLeuSerAspProGlyValSerProValLeuSerLeuGluMet                               515520525                                                                      LeuThrAspArgIleProTrpValAlaProGluCysLeuGluAlaThr                               530535540                                                                      LeuLeuGluAlaAspLysTrpGlyPheGlyAlaThrTrpGluValPhe                               545550555560                                                                   SerGlyMetIleLeuProAlaLysLysLeuPheTyrGluAspArgGln                               565570575                                                                      LeuAlaLysTrpThrGluLeuLeuIleGlnCysMetAlaTyrProArg                               580585590                                                                      ProSerArgAlaArgAspLeuAsnLeuIleSerAspTyrGluLeuLeu                               595600605                                                                      SerAspThrProArgAspLeuGlyAlaGlnLeuTyrAlaCysGlnAsp                               610615620                                                                      ProIlePheGluGluArgHisLeuLysTyrIleSerLeuGlyLysGly                               625630635640                                                                   PheGlySerValGluLeuCysArgTyrAspProLeuGlyAspAsnThr                               645650655                                                                      GlyLeuValAlaValLysGlnLeuGlnHisSerGlyProGlnGlnArg                               660665670                                                                      AspPheGlnArgGluIleGlnIleLeuLysAlaHisAspPheIleVal                               675680685                                                                      LysTyrArgGlyValSerTyrGlyProGlyArgGlnLeuValMetGlu                               690695700                                                                      TyrLeuProSerGlyCysLeuArgAspPheLeuGlnArgHisArgAla                               705710715720                                                                   LeuArgLeuLeuLeuGlnIleCysLysGlyMetGluTyrLeuGlyArg                               725730735                                                                      ArgCysValHisArgAspLeuAlaAlaArgAsnIleLeuValGluSer                               740745750                                                                      GluAlaHisValLysIleAlaAspPheGlyLeuAlaLysLeuLeuPro                               755760765                                                                      LeuLysAspTyrTyrValValArgProGlyGlnSerProIlePheTrp                               770775780                                                                      TyrAlaProGluSerLeuSerAspAsnIlePheSerArgGlnSerAsp                               785790795800                                                                   ValTrpSerPheGlyValValLeuTyrGluLeuPheThrTyrAspLys                               805810815                                                                      SerCysSerProSerGluPheLeuArgMetGlyGluArgLeuCysLeu                               820825830                                                                      LeuGluLeuLeuGluGlyArgLeuProProCysProGluVal                                     835840845                                                                      __________________________________________________________________________ 

We claim:
 1. An isolated polynucleotide sequence comprising a polynucleotide sequence encoding a polypeptide having an amino acid sequence of SEQ ID NO:2.
 2. The isolated polynucleotide sequence of claim 1, comprising a polynucleotide sequence encoding a polypeptide having an amino acid sequence of SEQ ID NO:2 and having at least one epitope for an antibody immunoreactive with JAK3.
 3. A host cell which contains the polynucleotide of claim 1 in an expression vector.
 4. A recombinant expression vector which contains the polynucleotide of claim
 1. 5. An isolated polynucleotide sequence, wherein the nucleotide sequence is selected from the group consisting of:a) SEQ ID NO:1; and b) nucleic acid sequences encoding a polypeptide according to SEQ ID NO:2. 